C0131

DTC C0131

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




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.
* DTC C0870 is not set.
* 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 and changes faster than physically allowed.



Action Taken When the DTC Sets

If equipped, the following actions occur:

* The EBCM disables the antilock brake system (ABS)/traction control system (TCS)/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 (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 EBCM


Circuit/System Testing

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

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

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

• If the DTC resets, test or replace the EBCM.




Repair Instructions

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

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