2010 Cadillac CTS Sedan AWD V6-3.6L Page 1863
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 Not Plausible
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The accelerator pedal assembly contains two accelerator pedal position (APP) sensors. The APP sensors are mounted in the pedal assembly and are
not serviceable. The APP sensors provide a signal voltage that changes relative to the position of the accelerator pedal. The engine control module
(ECM) supplies a separate 5 V reference and low reference circuit for each of the APP sensors.
The APP sensor 1 signal voltage increases as the pedal is depressed, from approximately 1.0 V at rest to approximately 4 V when fully depressed.
The APP sensor 2 signal voltage increases as the pedal is depressed, from approximately 0.5 V at rest to approximately 2 V with the accelerator
pedal fully depressed.
Conditions for Running the DTCs
* The ignition is ON or the engine is operating.
* The ignition voltage is greater than 7 V.
* The DTCs run continuously once the above conditions are met.
Conditions for Setting the DTC
P2122
The APP sensor 1 voltage is less than 0.74 V for greater than 1 s.
P2123
The APP sensor 1 voltage is greater than 4.82 V for greater than 1 s.
