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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0641

- 5 V Reference Circuit

DTC P06A6

- 5 V Reference Performance

Diagnostic Fault Information

Circuit/System Description

The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump control

module monitors the voltage signal from the fuel pressure sensor.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The fuel pump control module detects that the fuel pressure 5 V reference is above or below a predetermined voltage threshold.

Action Taken When the DTC Sets

DTCs P0641 and P06A6 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0641 and P06A6 are Type A DTCs.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records

can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the

diagnostic test reported a pass and/or a fail.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Fuel System

Description)Fuel System Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0101

- Mass Air Flow (MAF) Sensor Performance

Diagnostic Fault Information

Typical Scan Tool Data

Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),

and the throttle position sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of

barometric pressure (BARO), throttle position sensors, intake air temperature (IAT), and estimated MAP. The information from this model is

displayed on the scan tool as the MAF Performance Test parameter.

* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from

the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF

estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance

Test 1 parameter.

* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of

the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance

Test 2 parameter.

* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The

information from this model is displayed on the scan tool as the Throttle Position Sensors Performance Test parameter.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the

MAF, MAP, and the throttle position sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible

failure combinations and the resulting DTC or DTCs.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P06AC

- Transmission Control Module (TCM) Power Up Temperature Sensor Performance

DTC P06AD

- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit Low Voltage

DTC P06AE

- Transmission Control Module (TCM) Power Up Temperature Sensor Circuit High Voltage

Circuit/System Description

The transmission control module (TCM) power up temperature sensor is located inside of the control solenoid valve assembly which has no

serviceable parts. The TCM power up temperature sensor provides the temperature of the TCM when the TCM power is on. This temperature

reading is used in various shifting and diagnostic routines and also to protect the control solenoid valve assembly and TCM. This fault is handled

inside the TCM and no external circuits are involved.

Conditions for Running the DTC

P06AC

* DTCs P06AC, P0716, P0717, P0722, or P0723 are not set.

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* The TCM power up temperature is between -40 and +150掳C (-40 and +302掳F).

P06AD

* DTCs P06AD, P0716, P0717, P0722, or P0723 are not set.

* The transmission output shaft speed is 200 RPM or greater for 4 minutes.

* The torque converter clutch (TCC) slip speed is 120 RPM or greater for 4 minutes.

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

P06AE

* The engine speed is 500 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P06AE has not failed set this ignition.

Conditions for Setting the DTC

P06AC - Condition 1

* Vehicle speed is greater than 8 km/h (5 mph) for 5 minutes.

* TCC slip speed is greater than 150 RPM for 5 minutes.

* The TCM power up temperature is between -40 and +150掳C (-40 and +302掳F).

* The TCM power up temperature has changed by less than 2掳C (3.6掳F) in 100 seconds.

* The transmission fluid temperature (TFT) is 70掳C (158掳F) or greater.

* The TFT has increased by 55掳C (99掳F) since start-up.

Condition 2

* Vehicle speed is 8 km/h (5 mph) or greater for 300 seconds cumulative.

* TCC slip speed is greater than 120 RPM for 300 seconds cumulative.

* The TCM temperature sensor is between 120-150掳C (248-302掳F).

* The TCM power up temperature has changed by less than 2掳C (3.6掳F) in 2 minutes.

* The TFT is 70掳C (158掳F) or greater.

* The TFT has increased by 55掳C (99掳F) since start-up.

Condition 3

The TCM power up temperature changes by 20掳C (36掳F) or greater 5 times over 7 seconds.

P06AD

* The TCM power up temperature is -59掳C (-74掳F) or less for 13 seconds or greater.

* The TFT is 140掳C (284掳F) or greater for 60 seconds or more.

P06AE

The TCM power up temperature is 164掳C (327掳F) or greater for 10 seconds or more.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1278 01

- Auxiliary Input 1 Signal Circuit Short to Battery

DTC B1278 02

- Auxiliary Input 1 Signal Circuit Short to Ground

DTC B1279 01

- Auxiliary Input 2 Signal Circuit Short to Battery

DTC B1279 02

- Auxiliary Input 2 Signal Circuit Short to Ground

Circuit/System Description

A remote 3.5 mm auxiliary stereo jack allows playback of audio signals from remote devices (e.g., laptop computer, IPOD, MP3 player, etc.).

When a remote devices audio mini-plug is inserted in the remote auxiliary jack, an internal mechanical switch closes completing the aux jack detect

circuit to the radio. The radio automatically detects the input through the circuit and the device begins playing. The radio receives the devices audio

signals on the auxiliary input 1 (left) signal circuit and auxiliary input 2 (right) signal circuit.

Conditions for Running the DTC

The following are conditions that must be present in order for the radio to enable diagnostics:

* The ignition must be in the RUN or ACC position.

* The system voltage is at least 9.5 volts and no more than 15.5 volts.

Conditions for Setting the DTC

* The radio detects a short to battery on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.

* The radio detects a short to ground on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.

* All the above conditions are present for greater than 250 mS.

Action Taken When the DTC Sets

No audio is heard from the remote audio device.

Conditions for Clearing the DTC

* The conditions for setting the DTC are no longer present on the auxiliary input signal circuits.

* A history DTC clears after 50 malfunction-free ignition cycles.

Diagnostic Aids

* This DTC may be stored as a history DTC without affecting the operation of the module.

* If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

Reference Information

Schematic Reference

Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio System

Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1544 01

- Mirror Motors Common Circuit Short to Battery

DTC B1544 02

- Mirror Motors Common Circuit Short to Ground

DTC B1544 04

- Mirror Motors Common Circuit Open

DTC B1600 01

- Mirror Motor Vertical Circuit Short to Battery

DTC B1600 02

- Mirror Motor Vertical Circuit Short to Ground

DTC B1600 04

- Mirror Motor Vertical Circuit Open

DTC B1605 01

- Mirror Motor Horizontal Circuit Short to Battery

DTC B1605 02

- Mirror Motor Horizontal Circuit Short to Ground

DTC B1605 04

- Mirror Motor Horizontal Circuit Open

Diagnostic Fault Information

Circuit/System Description

The Driver Door Switch (DDM) or Passenger Door Switch (PDM) controls the mirror horizontal and vertical motors through the use of

bi-directional motor controls. When the mirror is commanded up and down, voltage or ground is supplied to the mirror vertical motor through the

mirror motor up/down control circuit and voltage or ground is supplied through the mirror motor common control circuit.

Horizontal controls operate in the same manner with the mirror motor left/right control circuit supplying voltage or ground and the mirror motor

common control circuit suppling voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B1544

An improper voltage level is detected on the mirror motor common control circuit.

B1600

An improper voltage level is detected on the mirror motor vertical control circuit.

B1605

An improper voltage level is detected on the mirror motor horizontal control circuit.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B2625 02

- Display Dimming Pulse Width Modulation Output Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The body control module (BCM)

supplies a reference voltage to the backlight dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired

brightness position, the dimmed voltage setting is applied through the dimmer switch and the dimmer switch signal circuit to the BCM. The BCM

interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the backlight lamp control circuit and the LED dimming

control circuit illuminating the components to the requested level.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM detects a short to ground in the LED dimming control circuit.

Actions Taken When the DTC Sets

The BCM will not attempt to illuminate the LED indicator lamps when a short circuit to ground is detected.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B3794 08

- Cruise Control Function Request Circuit Signal Invalid

DTC B3794 61

- Cruise Control Function Request Circuit Actuator Stuck

Diagnostic Fault Information

Circuit/System Description

The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate

and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function.

The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The BCM sends a serial data

message to the ECM indicating the status of the cruise control switches.

Conditions for Running the DTC

* The cruise switch is ON.

* The ignition is ON.

Conditions for Setting the DTC

B3794 08

The BCM detects an invalid voltage signal on the cruise control switch signal circuit for 0.5 second.

B3794 61

Stuck switch for either Resume/Accel or Set/Coast button for 60 seconds.

Actions Taken When the DTC Sets

* The malfunction indicator lamp (MIL) will not illuminate.

* The cruise control system is disabled.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Cruise Control Schematics (See: Cruise Control/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Cruise Control Description and Operation (See: Cruise Control/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0101

- Mass Air Flow (MAF) Sensor Performance

Diagnostic Fault Information

Typical Scan Tool Data

Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),

and the throttle position sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of

barometric pressure (BARO), throttle position sensors, intake air temperature (IAT), and estimated MAP. The information from this model is

displayed on the scan tool as the MAF Performance Test parameter.

* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from

the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF

estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance

Test 1 parameter.

* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of

the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance

Test 2 parameter.

* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The

information from this model is displayed on the scan tool as the Throttle Position Sensors Performance Test parameter.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the

MAF, MAP, and the throttle position sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible

failure combinations and the resulting DTC or DTCs.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0976

- Shift Solenoid (SS) 2 Control Circuit Low Voltage

DTC P0977

- Shift Solenoid (SS) 2 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The shift solenoid 2 is part of the control solenoid valve assembly and is not serviced separately. The control solenoid valve assembly supplies 12

volts to shift solenoid 2 on the high side driver 1 circuit. The control solenoid valve assembly controls the normally closed shift solenoid 2 on the

shift solenoid 2 control circuit. The shift solenoid 2 controls the transmission fluid to the 1-3 clutch regulator valve assembly.

In the OFF position, shift solenoid 2 controls the transmission fluid to the following components:

* EVT 1 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid low, 1-2 clutch

* Gear 1, oil is supplied to the hybrid low, 1-2 clutch and the 1-3 clutch

* Gear 2, oil is supplied to the hybrid low, 1-2 clutch and the hybrid direct 2-3-4 clutch

In the ON position, shift solenoid 2 controls the transmission fluid to the following components:

* EVT 2 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid direct 2-3-4 clutch

* Gear 3, oil is supplied to the hybrid direct 2-3-4 clutch and the 1-3 clutch

* Gear 4, oil is supplied to the hybrid direct 2-3-4 clutch and the 4th clutch

Conditions for Running the DTC

* The engine run time is greater than 5 seconds.

* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.

* The system voltage is 11-18 V.

Conditions for Setting the DTC

P0976

The transmission control module detects an internal low voltage electrical malfunction of the shift solenoid 2 control circuit when the shift solenoid

2 is commanded OFF for 1 second.

P0977

The transmission control module detects an internal high voltage electrical malfunction of the shift solenoid 2 control circuit when the shift

solenoid 2 is commanded ON for 1 second.

Action Taken When the DTC Sets

* DTCs P0976 and P0977 are Type A DTCs.

* The transmission control module defaults the transmission to EVT 1 or EVT 2 depending on vehicle speed.

* The transmission control module commands maximum line pressure.

* The transmission control module freezes transmission adaptive functions.

Conditions for Clearing the DTC

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B101D XX

- ECU Hardware

Circuit/System Description

The internal fault detection is handled inside the control module. The symptom byte listed in the DTC Descriptor is for engineering reference only.

No external circuit diagnosis is involved.

Conditions for Running the DTC

The module runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This

program runs even if the voltage is out of the valid operating range.

Conditions for Setting the DTC

The module has detected an internal malfunction.

Action Taken When the DTC Sets

The module refuses all additional inputs.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* This DTC may be stored as a history DTC without affecting the operation of the control module.

* Do not replace a control module based only on DTC B101D being set in history with the exception of the following control modules:

- K36 Inflatable Restraint Sensing and Diagnostic Module (SDM)

- K85 Passenger Presence Detection Module

- K10 Coolant Heater Control Module

* If DTC B101D is set as current, replace the appropriate control module.

Circuit/System Verification

Verify that DTC B101D is not set.

If the DTC is set, replace the module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming

B101E

DTC B101E

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

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DTC Descriptors

DTC P0842

- Transmission Fluid Pressure (TFP) Switch 1 Circuit Low Voltage

DTC P0843

- Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The transmission fluid pressure (TFP) switch 1 is part of the control solenoid valve assembly which has no serviceable parts. The TCM supplies a

signal circuit to the TFP Switch 1. The TFP Switch 1 has an internal case ground. TFP Switch 1 is normally closed or LOW. When oil pressure is

present at the TFP Switch 1, the switch is open or HIGH. The normally high clutch pressure control (PC) solenoid 2 controls pressure to the 3-5

reverse clutch regulator valve. The TCM monitors the TFP switch 1 to determine the position of the 3-5 reverse clutch regulator valve. When the

3-5 reverse clutch is commanded OFF, pressure is present on the TFP switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse

clutch regulator valve moves and pressure to the TFP switch 1 is exhausted through the 3-5 reverse clutch regulator valve.

Conditions for Running the DTC

P0842 or P0843

* DTCs P0751, P0752, P0756, P0757, P0973, P0974, P0977, P1825 or P1915 are not set.

* Ignition voltage is 8.6 volts or greater.

* The transmission fluid temperature (TFT) is 0-120掳C (32-248掳F).

* Engine speed is 500 RPM or greater for 5 seconds.

Conditions for Setting the DTC

P0842

The TCM detects that the TFP switch 1 signal voltage remains LOW after the 3-5-R clutch transitions from a HIGH pressure state to a LOW

pressure state. The TCM counts each incident. The DTC sets when 35 counts are accumulated.

P0843

The TCM detects that the TFP switch 1 signal voltage remains HIGH after the 3-5-R clutch transitions from a LOW pressure state to a HIGH

pressure state. The TCM counts each incident. The DTC sets when 25 counts are accumulated.

Action Taken When the DTC Sets

* DTCs P0842 and P0843 are Type C DTCs.

* The TCM freezes transmission adaptive functions.

Conditions for Clearing the DTC

DTCs P0842 and P0843 are Type C DTCs.

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DTC Descriptor

DTC P0615

- Starter Relay Control Circuit

Diagnostic Fault Information

Circuit/System Description

When the ignition switch is placed in the start position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition

is in the start position. The BCM sends a serial data message to the engine control module (ECM) that crank has been requested. The ECM then

verifies that the automatic transmission is in Park or Neutral, and that the immobilizer is not disabling engine starting. If conditions are acceptable

for cranking, then the ECM supplies 12 V to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the

switch of the STRTR relay to terminal S X2 of the starter solenoid, and the engine cranks. The ECM monitors the voltage on the STRTR relay

control circuit. If the ECM detects that the STRTR relay control circuit is open, shorted to ground, or shorted to voltage, then DTC P0615 sets.

Conditions for Running the DTC

* The ignition is ON or in the start position.

* The battery voltage is 9.5-18 V.

Conditions for Setting the DTC

The ECM detects that the control circuit of the STRTR relay is open, shorted to ground, or shorted to voltage for 2 seconds.

Action Taken When the DTC Sets

DTC P0615 is a type C DTC.

Conditions for Clearing the DTC

The DTC passes when the ECM detects that the failure is no longer present for 2 seconds.

Reference Information

Schematic Reference

Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Starting System Description and Operation (See: Starting and Charging/Starting System/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

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DTC Descriptors

DTC P0451

- Fuel Tank Pressure (FTP) Sensor Performance

DTC P0452

- Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

DTC P0453

- Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

DTC P0454

- Fuel Tank Pressure (FTP) Sensor Intermittent

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The fuel tank pressure (FTP) sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The engine control module

(ECM) supplies a 5-volt reference and a low reference circuit to the FTP sensor. The FTP sensor signal voltage varies depending on EVAP system

pressure or vacuum. The controller also uses this FTP signal to determine atmospheric pressure for use in the engine-off small leak test, DTC

P0442. Before using this signal as an atmospheric reference it must first be re-zeroed.

Conditions for Running the DTC

P0451

* DTC P0451 runs only when the engine-off natural vacuum small leak test, P0442, executes.

* The number of times this test runs can range from 0-2 per engine-off period. The length of the test can be up to 10 minutes.

P0452 and P0453

DTC P0452 and P0453 run continuously when the ignition is ON.

P0454

* DTC P0454 runs only when the engine-off natural vacuum small leak test, P0442, executes.

* This test can run once per engine-off period. The length of the test can be up to 10 minutes.

* A refueling event is not detected.

Conditions for Setting the DTC

P0451

This DTC will set if the controller is unable to re-zero the FTP sensor voltage within a calibrated range during the engine-off small leak test, P0442.

P0452

The FTP sensor voltage is less than 0.1 volt for more than 5 seconds.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P1824

- Internal Mode Switch P Circuit High Voltage

DTC P182A

- Internal Mode Switch A Circuit Low Voltage

DTC P182B

- Internal Mode Switch B Circuit Low Voltage

DTC P182C

- Internal Mode Switch B Circuit High Voltage

DTC P182D

- Internal Mode Switch P Circuit Low Voltage

DTC P182E

- Internal Mode Switch-Invalid Range

DTC P182F

- Internal Mode Switch C Circuit High Voltage

DTC P1838

- Internal Mode Switch A Circuit High Voltage

DTC P1839

- Internal Mode Switch C Circuit Low Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Transmission Internal Mode Switch Logic

Circuit/System Description

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch (IMS) assembly, is a dual sliding

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0171

- Fuel Trim System Lean Bank 1

DTC P0172

- Fuel Trim System Rich Bank 1

DTC P0174

- Fuel Trim System Lean Bank 2

DTC P0175

- Fuel Trim System Rich Bank 2

Circuit/System Description

The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel

economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM

determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of

purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 %.

If the HO2S indicates a rich condition, the FT values will be below 0 %. The short term FT values change rapidly in response to the HO2S voltage

signals. The long term FT makes coarse adjustments in order to maintain an optimum air/fuel ratio. A block of cells contain information arranged in

combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average

of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a

rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.

If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets. If the ECM detects an excessively rich condition, DTC P0172 or

P0175 sets.

Conditions for Running the DTC

* DTCs P0030, P0036, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0128, P0130, P0131, P0132,

P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0208, P0220, P0300, P0301-P0304, P0442, P0443, P0446, P0449,

P0452, P0453, P0455, P0496, P1106, P1107, P1114, P1115, P1133, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176 are not set.

* The engine is in Closed Loop status.

* The engine coolant temperature (ECT) is between -40 and +150掳C (-40 and +302掳F).

* The intake air temperature (IAT) is between -20 and +150掳C (-4 and +302掳F).

* The manifold absolute pressure (MAP) is between 10-255 kPa (1.45-37 psi).

* The vehicle speed is less than 134 km/h (83 mph).

* The engine speed is between 375-7,000 RPM.

* The mass air flow (MAF) is between 1-510 g/s.

* The barometric pressure (BARO) is more than 70 kPa (10.2 psi).

* The fuel level is more than 10 %.

* This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC

* The average long term FT weighted average value is more or less than a calibrated value.

* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets

The ECM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the ECM stores this information in the

Failure Records. If the diagnostic reports a failure on the second ignition cycle the ECM records the operating conditions at the time of the failure.

The ECM writes the operating conditions to the Freeze Frame and updates the Failure Records. The ECM illuminates the malfunction indicator

lamp (MIL) when one of the following occur:

* The ECM detects the same fuel trim failure during 2 consecutive trips.

* The ECM detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria:

- The engine load is within 20 % of the previous test that failed.

- The engine speed is within 375 RPM of the previous test that failed.

- The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC

* The ECM turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, after 3 ignition cycles that the

diagnostic runs and does not fail.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P162B

- Remote Vehicle Speed Limiting Signal Message Counter Incorrect

Circuit/System Description

When a Slow-Down request is sent from OnStar(R) the vehicle communication interface module (VCIM) sends a serial data message to the engine

control module (ECM) indicating that reduced vehicle speed has been requested. Once the request is active the ECM begins reducing engine torque

to match requested vehicle speed and a REDUCED ENGINE POWER indications is displayed. No DTCs will be set during this process.

The ECM monitoring the serial data message for specific validity traits. If the ECM determines that the validity of the message is in error DTC

P162B will be set.

Conditions for Running the DTC

* The engine run time is greater than 5 seconds.

* No other serial data errors are present.

Conditions for Setting the DTC

* The VIN embedded in the Slow-Down serial data request does not match the VIN stored in the ECM.

* The rolling code counter embedded in the Slow-Down serial data request does not increment for 10 consecutive messages.

Action Taken When the DTC Sets

* ECM disregards all reduced vehicle speed request messages from the VCIM.

* The ECM stores DTC P162B in ECM history.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

* A scan tool clear DTC request is performed.

Reference Information

Description and Operation

Remote Vehicle Speed Limiting Description and Operation (Stolen Vehicle Slow-Down) (See: Accessories and Optional Equipment/Antitheft and

Alarm Systems/Description and Operation/Remote Vehicle Speed Limiting)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

If the DTC is set, perform the Stolen Vehicle Slow-Down Clear with a scan tool. If the DTC resets, replace the VCIM. If the DTC resets again,

replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

Control Module References (See: Testing and Inspection/Programming and Relearning) for VCIM and ECM replacement, setup, and

programming

P0171

DTC P0171, P0172, P0174, or P0175

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P16F3

- Control Module Redundant Memory Performance

Circuit/System Description

This is an internal fault detection of the transmission control module. This fault is handled inside the transmission control module and no external

circuits are involved. The transmission control module is part of the control solenoid valve assembly, and is not serviced separately.

Conditions for Running the DTC

* The control solenoid valve assembly runs the program to detect an internal fault when the key is ON or the engine is running.

* Ignition voltage is 8-18 V.

Conditions for Setting the DTC

The control solenoid valve assembly has detected an internal malfunction.

Action Taken When the DTC Sets

* DTC P16F3 is a Type A DTC.

* The transmission control module shifts to a default gear and turns OFF.

Conditions for Clearing the DTC

DTC P16F3 is a Type A DTC

Diagnostic Aids

When attempting to set transmission control module internal DTCs, run the engine for at least 1 minute, and then shut the engine OFF for 30

seconds. Following this procedure will allow for a complete transmission control module shutdown. Program the transmission control module with

the latest software version and retest the DTC to see if the DTC resets.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.

Circuit/System Verification

Verify that DTC P16F3 is not set.

If the DTC is set, program the Q8 control solenoid valve assembly. If the DTC resets, replace the Q8 control solenoid valve assembly.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P06B1

- Sensor Positive Voltage Circuit 1 Low Voltage

DTC P06B2

- Sensor Positive Voltage Circuit 1 High Voltage

DTC P06B4

- Sensor Positive Voltage Circuit 2 Low Voltage

DTC P06B5

- Sensor Positive Voltage Circuit 2 High Voltage

Circuit/System Description

The drive motor generator power inverter module (PIM) contains two motor control modules (MCM) and a hybrid powertrain control module

(HPCM). The MCMs share an internal 15 volt reference power supply in order to operate the drive motor sensors processors. This fault is handled

inside the PIM and no external circuits are involved.

Conditions for Running the DTC

* The control module runs the program to detect an internal fault when the key is ON.

* Ignition voltage is 8-18V.

Conditions for Setting the DTC

P06B1 or P06B4

The reference voltage is less than 12 V for 1 second.

P06B2 or P06B5

The reference voltage is greater than 18 V for 1 second.

Action Taken When the DTC Sets

* DTCs P06B1, P06B2, P06B4 and P06B5 are Type B DTCs.

* The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTCs P06B1, P06B2, P06B4 and P06B5 are Type B DTCs.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Circuit/System Verification

1. Clear the DTC information.

2. Turn the ignition OFF for 1 minute.

3. Turn the ignition ON.

4. Retest for DTCs P06B1, P06B2, P06B4 and P06B5.

Circuit/System Testing

1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.

2. Shut the ignition OFF for 30 seconds, and verify that the DTC does not reset.

瀚慖f the DTC resets, replace the PIM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2178

- Fuel Trim System Rich at Cruise or Acceleration Bank 1

DTC P2180

- Fuel Trim System Rich at Cruise or Acceleration Bank 2

DTC P2188

- Fuel Trim System Rich at Idle Bank 1

DTC P2190

- Fuel Trim System Rich at Idle Bank 2

Circuit Description

The fuel trim control system monitors the range of the air/fuel ratio in order to maintain the desired ratio for optimum emissions performance. The

system performs tests during certain operating conditions to detect unmetered air or unmetered fuel. The fuel trim control system operation can be

observed by monitoring the scan tool Short Term and Long Term Fuel Trim parameters.

Conditions for Running the DTC

P2178 or P2180

* Before the ECM can report DTC P2178 or P2180, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013,

P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0101, P0121, P0122, P0123, P0133, P0153, P0201, P0202, P0203,

P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0300, P0301, P0302,

P0303, P0304, P0305, P0306, P0335, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091,

P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.

* The engine speed is between 1,200-3,400 RPM.

* The engine load is between 13-40 %.

* The throttle angle is less than 100 %.

* The cold start fuel control is not active.

* The Closed Loop fuel control is enabled.

* The engine is not in decel fuel cut-off.

* The intake air temperature (IAT) is colder than 60掳C (140掳F).

* The calculated amount of fuel metered into the engine is greater than 700 g.

* DTCs P2178 and P2180 run continuously when the above conditions are met for approximately 300 s, after Closed Loop fuel control is

enabled.

P2188 or P2190

* Before the ECM can report DTC P2188 or P2190, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013,

P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0101, P0121, P0122, P0123, P0133, P0153, P0201, P0202, P0203,

P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0300, P0301, P0302,

P0303, P0304, P0305, P0306, P0335, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091,

P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.

* The engine speed is between 519-1,001 RPM.

* The engine load is between 0-24 %.

* The throttle angle is less than 100 %.

* The cold start fuel control is not active.

* The Closed Loop fuel control is enabled.

* The engine is not in decel fuel cut-off.

* The engine coolant temperature (ECT) is warmer than 60掳C (140掳F).

* The intake air temperature (IAT) is colder than 61掳C (142掳F).

* The calculated amount of fuel metered into the engine is greater than 700 g.

* DTCs P2188 and P2190 run continuously when the above conditions are met for approximately 300 s, after Closed Loop fuel control is

enabled.

Conditions for Setting the DTC

P2178 or P2180

The Long Term Fuel Trim Cruise/Accel is less than -22 % for 4 s or for a cumulative of 30 s.

P2188 or P2190

The Long Term Fuel Trim Idle/Decel is less than -6 % for 4 s or for a cumulative of 30 s.

Action Taken When the DTC Sets

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Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0641

- 5 V Reference Circuit

DTC P06A6

- 5 V Reference Performance

Diagnostic Fault Information

Circuit/System Description

The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump control

module monitors the voltage signal from the fuel pressure sensor.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The fuel pump control module detects that the fuel pressure 5 V reference is above or below a predetermined voltage threshold.

Action Taken When the DTC Sets

DTCs P0641 and P06A6 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0641 and P06A6 are Type A DTCs.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records

can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the

diagnostic test reported a pass and/or a fail.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Fuel System

Description)Fuel System Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)