2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1838
P2123
The APP sensor 1 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.
P2127
The APP sensor 2 voltage is less than 0.63 volt for greater than 1 s or for a cumulative time of 4 s.
P2128
The APP sensor 2 voltage is greater than 4.82 volts for greater than 1 s or for a cumulative time of 4 s.
P2138
* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.25 volts when the sensor voltages are between
1.91-1.25 V.
* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.31 volts when the sensor voltages are between
1.91-2.63 V.
* The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 1.7 volts when the sensor voltages are greater than
2.63 V.
* DTC P2138 sets if any of the above conditions exist for greater than 1 s or for a cumulative time of 4 s.
Action Taken When the DTC Sets
DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.
Diagnostic Aids
Test the current output of the 5-volt reference circuits if you suspect high resistance in the circuit. The current output should be greater than 80 mA
for APP 1 and greater than 50 mA for APP 2.
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
Throttle Actuator Control (TAC) System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Throttle Actuator Control (TAC) 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)
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
1. Ignition ON, observe the DTC information with a scan tool. DTC P0651, P0652, P0653, P0697, P0698, or P0699 should not be set.
