2010 Cadillac Truck SRX AWD V6-3.0L Page 1201
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen
Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 2)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P150C
DTC P150C (LF1)
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.
DTC Descriptor
DTC P150C
- Transmission Control Module Engine Speed Request Signal Message Counter Incorrect
Circuit/System Description
This diagnostic applies to communication integrity between the engine control module (ECM) and the transmission control module (TCM). The
ECM determines that the engine speed signal counter is incorrect for the current vehicle operation.
Conditions for Running the DTC
* The ignition switch is in Unlock, Accessory, Run or Crank.
* The system voltage is more than 5.23 V.
* DTCs P0601, P0602, P0603, P0604, P0606, P0607, P062F, P0641, P0651, P2610 and U0101 are not set.
Conditions for Setting the DTC
The ECM detects that the TCM engine speed request circuit does not match the expected engine speed request circuit. Each test runs in 5
milliseconds. This DTC runs continuously.
Action Taken When the DTC Sets
DTC P150C is a Type B DTC.
Conditions for Clearing the DTC
DTC P150C is a Type B DTC.
Reference Information
Description and Operation
Engine Control Module Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Engine Control
Module Description)
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
Engine Control Module Scan Tool Information (LF1,LFW) (See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures)Engine Control Module Scan Tool Information (LAU) (See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures)for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. DTC U0101 should not be set.
瀚慖f DTC U0101 is set, repair that DTC first.
2. Observe the DTC information with a scan tool. DTCs P0601, P0603, P0604, P0606, P0607, P0610, P062B, P0630, P167D or P2610 should
not set. If a DTC failed this ignition, replace the K20 ECM. Operate the vehicle within the Conditions for Running the DTC to verify the
