C0161

DTC C0161

Circuit Description
The brake pedal position (BPP) sensor is an input to the body control module (BCM). The BCM then sends a serial data message to the electronic brake control module (EBCM) and other electronic control modules. The BPP sensor is a potentiometer type sensor with a 5-volt reference circuit and a low reference circuit. The BCM supplies the 5-volt reference to the BPP.

DTC Descriptors
This diagnostic procedure supports the following DTC:

DTC C0161 ABS/TCS Brake Switch Circuit





This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description.

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/second (5 mph/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/second (7 mph/second).

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The EBCM disables the 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 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 BPP sensor.