With StabiliTrak

DTC C0161 (With StabiliTrak)

Diagnostic Instructions

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

DTC Descriptor
DTC C0161 5A
- Antilock Brake System (ABS) Brake Switch Circuit Plausibility Failure

Circuit/System Description

The electronic brake control module (EBCM) detects inputs from the brake pressure sensor, vehicle speed, and a serial data message from the body control module (BCM) that the brake pedal is applied. When the vehicle is stopping the EBCM monitors for the brake pedal is pressed, with the brake pressure increasing and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is not pressed and brake pressure is not increasing.

Conditions for Running the DTC

* Ignition ON.
* The vehicle speed is greater than 16 km/h (10 mph).

Conditions for Setting the DTC

* The EBCM detects the vehicle speed greater than 21 km/h (13 mph), the brake pedal is Applied for 1 minute, and brake pressure is not increasing.
* The EBCM detects brake pedal is Released and the vehicle speed is decreasing while the brake pressure is increasing.

Action Taken When the DTC Sets

* The EBCM disables the traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* The Traction Control indicator turns ON.
* The driver information center (DIC) displays Service Stability System message.
* The antilock brake system (ABS) remains functional.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

The DTC C0161 00 can be set if the brake pedal is applied while accelerating.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

ABS Description and Operation (with StabiliTrak) (ABS Description and Operation (with StabiliTrak))ABS Description and Operation (without StabiliTrak) (ABS Description and Operation (without StabiliTrak))
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool EBCM BPP parameter while applying and releasing the brake pedal. The reading should change between Applied and Released.

• If the parameter does not change between applied and release, replace the EBCM.

2. Replace the BPMV.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (Without JL4) (Brake Pressure Modulator Valve Replacement (Without JL4)) Brake Pressure Modulator Valve Replacement (With JL4) (Brake Pressure Modulator Valve Replacement (With JL4))
* Control Module References (Programming and Relearning)for EBCM replacement, setup, and programming