2010 Cadillac CTS Sedan AWD V6-3.0L Page 1840
DTC P2123
- Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage
DTC P2127
- Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
DTC P2128
- Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage
DTC P2138
- Accelerator Pedal Position (APP) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted to the accelerator pedal
assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to pedal position. The engine control module
(ECM) supplies each APP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.
Both the APP sensors 1 and 2 signal percentages increase as the pedal is depressed, from approximately 0 percent at rest to above 95 percent when
fully depressed.
Conditions for Running the DTC
P2122, P2123, P2127, or P2128
* DTC P06A3 or P0697 are not set.
* The ignition is ON or the engine is operating.
* The ignition voltage is greater than 6 volts.
* The ECM is not commanding reduced power.
* The DTCs run continuously when the above conditions are met.
P2138
* DTCs P06A3, P0697, P2122, P2123, P2127, or P2128 are not set.
* The ignition is ON or the engine is operating.
