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 Pressure Circuit

DTC C0131 3A
- Pressure Circuit Incorrect Component Installed

DTC C0131 5A
- Pressure Circuit Calibration Not Learned




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 (W/O 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. Replace EBCM/brake pressure modulator valve (BPMV) assembly.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Brake Pressure Modulator Valve Replacement (Without JL4) (Service and Repair)Brake Pressure Modulator Valve Replacement (With JL4) (Service and Repair)Brake Pressure Modulator Valve Replacement (J92) (Service and Repair)
* Electronic Brake Control Module Replacement (Without JL4) (Service and Repair)Electronic Brake Control Module Replacement (With JL4) (Service and Repair)Electronic Brake Control Module Replacement (J92) (Service and Repair)
* Control Module References for EBCM replacement, setup, and programming