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 Descriptors
DTC C0131 00
- ABS Pressure Circuit No Additional Information

DTC C0131 4B
- ABS Pressure Circuit Calibration Not Learned

DTC C0131 5A
- ABS Pressure Circuit Calibration Not Learned Plausibility Failure




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 is ON.


Conditions for Setting the DTC

* 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.
* Brake pedal does not return completely causing residual brake pressure.



Action Taken When the DTC Sets

* The EBCM disables the VSES and TCS for the duration of the ignition cycle.
* The traction control indicator illuminates.



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.



Diagnostic Aids

* Inspect for a binding or obstructed brake pedal or an improperly installed stop lamp switch causing residual brake pressure.
* The pressure sensor is integral to the brake pressure modulator valve (BPMV). The pressure sensor is not serviceable.
* Inspect the brake pressure sensor contacts for proper connections.



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 Reference

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 scan tool information


Circuit/System Testing

Important: Ensure the stoplamp switch is properly installed allowing the brake pedal to be fully released.



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

• If not within the specified value, Refer to Symptoms - Lighting Systems (- Symptoms - Lighting Systems) .

2. Verify DTC C0131 is not set.

• If DTC is set, replace the BPMV and verify DTC does not reset. If DTC resets 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.