Without StabiliTrak

DTC C0131 (Without 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 Descriptors
DTC C0131 01
- Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit Short to Battery

DTC C0131 04
- ABS/TCS Pressure Circuit Short to Ground or Open

DTC C0131 5A
- ABS/TCS Pressure Circuit Plausibility Failure

Circuit/System Description

The brake pressure sensor detects a change in the hydraulic brake system as pressure increases in the front brake circuits. The electronic brake control module (EBCM) uses inputs from the brake pressure sensor and the brake switch signal to control accurate braking. The brake pressure sensor is internal to the brake pressure modulator valve (BPMV).

Conditions for Running the DTC

* Ignition ON.
* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

* Internal pressure sensor fault.
* Brake signal does not correlate to brake pressure sensor.
* Signal is erratic and changes faster than physically allowed.

Action Taken When the DTC Sets

* The EBCM disables the ABS for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.

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.

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 Testing

1. Apply and release brake pedal. Verify the brake stop lamps operate properly.

• If the brake stop lamps do not operate properly, refer to Symptoms - Lighting (Symptoms - Lighting).

2. Replace the EBCM/BPMV assembly.

Repair Instructions

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

Control Module References (Programming and Relearning) for EBCM/BPMV replacement, programming and setup