C0131

DTC C0131

Diagnostic Instructions

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



DTC Descriptors
DTC C0131 00
- Antilock Brake System (ABS) Traction Control System (TCS) Pressure Circuit

DTC C0131 5A
- Antilock Brake System (ABS) Traction Control System (TCS) Pressure Circuit Plausibility Failure




Circuit/System Description

The electronic brake control module (EBCM) uses input from the brake pedal position sensor for more accurate control during a Vehicle Stability Enhancement System (VSES) event.


Conditions for Running the DTC

* System Voltage is above 9 volts.
* The ignition is ON.
* The vehicle speed is greater than 40 km/h (24 mph).



Conditions for Setting the DTC

* Voltage at the pressure sensor signal output to the EBCM falls outside the 0.25-4.75 voltage range for more than 100 milliseconds.
* Brake signal does not correlate to pressure signal.
* Signal is erratic.



Action Taken When the DTC Sets

If equipped, the following actions occur:

* The EBCM disables the Antilock Brake System (ABS), Traction Control System (TCS) Vehicle Stability Enhancement System VSES for the duration of the ignition cycle.
* The Traction Control indicator turns ON.
* The driver information center (DIC) displays the Service Stability System message.
* A malfunction DTC will set.
* The ABS indicator turns ON.
* The stability OFF indicator turns OFF.
* The red BRAKE warning indicator could turn ON.



Conditions for Clearing the DTC

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



Reference Information
Schematic Reference

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

Component Connector End Views
Description and Operation

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

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

Scan Tool Reference

Control Module References for scan tool information


Circuit/System Validation

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

• If brake lamps do not operate properly, refer to Symptoms - Lighting Systems .

2. Replace brake pressure modulator valve (BPMV) assembly.

• If DTC resets, replace the EBCM.




Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References for EBCM replacement, setup, and programming