C0131

DTC C0131

Diagnostic Instructions

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

DTC Descriptors
DTC C0131 00
- ABS Pressure Circuit

DTC C0131 5A
- ABS Pressure Circuit Plausibility Failure

Circuit/System Description

The BPMV internal hydraulic brake pressure sensor (BPS) provides brake pressure input to the EBCM. This BPS data is utilized during VSES events. The EBCM also monitors the brake pressure sensor BPS and the body control module (BCM) serial data message of the brake pedal position sensor (BPPS). These readings are compared between the BPS and BPPS and are used to insure the actual braking intent of the driver, during conditions when the brake is applied and when the brake released/decel-accel.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

C0131 00

The EBCM detects an internal pressure sensor fault.

C0131 5A
* The EBCM detects the brake pressure sensor (BPS) input readings does not correlate internally.
or
* The EBCM detects the brake pressure the brake pressure sensor reading does not correlate with the serial data message of the brake pedal position (BPP) sensor when the vehicle is stopping, brake pressure is increasing, and the brake pedal is detected as released , or the vehicle is accelerating, brake pressure is not increasing, and the brake pedal is detected as applied.

Action Taken When the DTC Sets

* The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

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

Diagnostic Aids

* C0131 5A may be set due to a BPPS offset ratio greater than allowed by the EBCM calibrations causing a delay brake applied/released signal from the BCM during EBCM monitoring. If there is a need to relearn the BPPS, then there may be other issues related to the BPPS and circuits.
* The EBCM calibrations for the brake pressure sensors adjusts for minor offset differences between the sensor inputs and can be reset with the scan tool special functions steering angle sensor (SAS) calibration. Under normal vehicle conditions the BPS should not need calibrating unless a BPMV is replaced.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
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 (Circuit Testing)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
* Connector Repairs (Connector Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Verify that DTC C0277, C0278 or C0870 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle)

2. Perform the BPPS calibration. Refer to Brake Pedal Position Sensor Calibration (Brake Pedal Position Sensor Calibration)
3. Perform the SAS calibration to reset the brake pressure sensor offset values. Refer to Steering Angle Sensor Centering (Procedures)
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset.

• If DTC is set, replace the BPMV. If DTC reset replace the EBCM.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (Without JL4) (Brake Pressure Modulator Valve Replacement (Without JL4))Brake Pressure Modulator Valve Replacement (With JL4) (Brake Pressure Modulator Valve Replacement (With JL4))Brake Pressure Modulator Valve Replacement (With JL4, LNF) (Brake Pressure Modulator Valve Replacement (With JL4))
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming