C0161
DTC C0161
Circuit Description
The brake pedal position sensor (BPP) is an input to the electronic brake control module (EBCM). The brake pedal position sensor is a potentiometer type sensor with a 5-volt reference circuit and a low reference circuit. The body control module (BCM) supplies the 5-volt reference to the BPP.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0161 ABS/TCS Brake Switch Circuit
Conditions for Running the DTC
C0161 11
* The ignition is ON.
* The vehicle speed is greater than 16 km/h (10 mph)
* The ignition voltage is greater than 8 volts.
C0161 12
* The ignition is ON.
* The ignition voltage is greater than 8 volts.
Conditions for Setting the DTC
C0161 11
* The brake pedal is sensed as applied.
* The vehicle speed is greater than 40 km/h (25 mph).
* The vehicles acceleration exceeds 8 km/h per second (5 mph per second).
C0161 12
* Brake pedal is not applied.
* Master cylinder pressure is greater than 150 psi.
* The vehicle speed is greater than 24 km/h (14 mph).
* The vehicles deceleration exceeds 11.5 km/h per second (7 mph per second).
Action Taken When the DTC Sets
If equipped, the following actions occur:
* The EBCM disables the engine drag control (EDC) / tire pressure monitor (TPM) / Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
* Traction Control System (TCS) is degraded.
* The Traction Control and Active Handling indicator turns ON.
* The driver information center (DIC) displays the following messages:
- Service Traction System
- Service Active Handling
* The ABS remains functional.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
C0161 11
Possible causes of this DTC are the following conditions:
* The brake pedal position sensor circuit is shorted to voltage.
* The brake pedal position sensor needs recalibration.
* A brake pedal that is binding.
C0161 12
Possible causes of this DTC are the following conditions:
* A signal circuit of the brake pedal position sensor is open.
* The brake pedal position sensor needs recalibration.
* All brake lamps are open.
* All brake lamp grounds are open.
* An internal brake pedal position sensor malfunction.
Test Description
The number below refers to the step number on the diagnostic table.
2. Test for the current state of the brake pedal position sensor.
