C0161
DTC C0161
Circuit Description
The brake pedal position (BPP) sensor is an input to the electronic brake control module (EBCM). The BPP 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.
* The 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 BPP sensor circuit is shorted to voltage.
* The BPP 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 BPP sensor is open.
* The BPP sensor needs recalibration.
* All brake lamps are open.
* All brake lamp grounds are open.
* An internal BPP 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.
