C0161

DTC C0161

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC C0161 11
- ABS/TCS Brake Switch Circuit Above Maximum Threshold

DTC C0161 12
- ABS/TCS Brake Switch Circuit Below Minimum Threshold




Circuit/System 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.


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.
* Traction control is not active.
* The vehicle has reached speed greater than 24 km/h (14 mph).
* The vehicles deceleration exceeds 11.5 km/h per second (7 mph per second).
* Conditions for setting the DTC occur 3 times.



Action Taken When the DTC Sets

No systems are disabled and no warning indicators or messages will appear.


Diagnostic Aids

The DTC C0161 11 can be set if the vehicle has been driven with the brake applied during acceleration.


Reference Information
Schematic Reference

Antilock Brake System Schematics ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for Scan Tool Information


Circuit/System Verification

1. 1. Verify DTC C0277 or C0278 is not set.

• If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions)