C0161

Programming and Relearning

DTC C0161

DTC Descriptor
DTC C0161
- TCS Brake Switch Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

The brake pedal position (BPP) sensor is an input to the body control module (BCM). The BCM activates the brake lamps when the BPP is in an applied state. The BCM then sends a brake pedal applied state status via serial data messages 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

The Ignition is ON.

Conditions for Setting the DTC

* Brake pedal is sensed as applied during moderate to high vehicle acceleration.
* Brake pedal state is observed as applied for 144 consecutive seconds.

Action Taken When the DTC Sets

* EBCM disables the traction control system (TCS) for the duration of the ignition cycle.
* The Traction Control indicator turns ON.
* Driver information center (DIC) displays the SERVICE TRACTION message.

Conditions for Clearing the MIL/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

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

Reference Information

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. With the scan tool, check the vehicle for brake pedal position (BPP) related DTCs.

^ If DTC C0277 or C0297 are present, diagnose BPP DTCs.

2. Lightly apply and release the brake pedal. The stop lamps should illuminate and then turn OFF.

^ If the stop lamps do not operate properly, refer to Symptoms - Lighting Systems. - Symptoms - Lighting

3. If no Lighting System problems can be found, refer to Diagnostic Aids.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
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