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 01
- ABS Pressure Circuit Short to Battery

DTC C0131 06
- ABS Pressure Circuit Short to Ground or Open

DTC C0131 55
- ABS Pressure Circuit Expected Number of Transition/Events Exceded

DTC C0131 4B
- ABS Pressure Circuit Calibration Not Learned

DTC C0131 5A
- ABS Pressure Sensor Plausibility Failure

DTC C0131 0F
- ABS Pressure Circuit Erratic




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.
* Ignition voltage is greater than 9.5 volts.



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.



Action Taken When the DTC Sets

* The EBCM disables the VSES and TCS for the duration of the ignition cycle.
* The electronic stability control (ESC) telltale turns ON.



Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.



Diagnostic Aids

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 (Except JL7) (Antilock Brake System Schematics (Except RPO JL7))Antilock Brake System Schematics (JL7) (Antilock Brake System Schematics (With RPO JL7))
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation Reference

ABS Description and Operation (Without JL7) (ABS Description and Operation (Without RPO JL7))ABS Description and Operation (With JL7) (ABS Description and Operation (With RPO JL7))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing

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

• If brake lamps do not operate properly, review brake lamps inoperative.

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



Repair Instructions

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


Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming