C0131

DTC C0131

Diagnostic Instructions

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

DTC Descriptors

DTC C0131 00

ABS Pressure Circuit

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.

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

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

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement
* Electronic Brake Control Module Replacement
* Programming and Relearning Programming and Relearning