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
- ABS/TCS System Pressure Circuit Malfunction

DTC C0131 0A
- ABS/TCS Pressure Circuit Rate of Change Below Threshold

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

DTC C0131 09
- ABS/TCS Pressure Circuit Rate of Change Above Threshold




Diagnostic Fault Information






Circuit/System Description

The electronic brake control module (EBCM) uses input from the brake pressure sensor for more accurate control during a vehicle stability enhancement system (VSES) event.


Conditions for Running the DTC

* The ignition switch is in the ON position.
* Ignition voltage is greater than 9.5 volts.



Conditions for Setting the DTC

* Internal pressure sensor line fault.
* Pressure signal does not correlate to estimated Pressure over time.
* Brake Signal does not correlate to Pressure Signal.
* Signal is erratic and changes faster than physically allowed.



Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS)/traction control system/(TCS) and vehicle stability enhancement system/(VSES) for the duration of the ignition cycle.
* The ABS/TCS and stabilitrak indicator turns ON.
* The Service Traction Control, and stabilitrak displayed on the DIC.



Conditions for Clearing the DTC

* The condition for 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.



Diagnostic Aids

The brake fluid pressure sensor is integral to the BPMV/EBCM. The brake fluid pressure sensor is not serviceable. After replacing a BPMV and the DTC resets as a current code, it may be necessary to perform a brake pressure sensor calibration with the Tech 2 in ABS, special function.


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 (w/JL4) (ABS Description and Operation (With RPO JL4))ABS Description and Operation (without JL4) (ABS Description and Operation (Without RPO JL4))
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 Testing

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

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

2. If all circuits test normal, replace the EBCM/brake pressure modulator valve (BPMV) assembly.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Control Module References for EBCM/BPMV replacement, setup, and programming-Following the EBCM/BPMV replacement, perform the Yaw Rate Reference Table Resetting (Programming and Relearning) .
* Brake Pressure Modulator Valve Replacement (w/JL4) (Service and Repair)Brake Pressure Modulator Valve Replacement (w/o JL4) (Service and Repair)