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 Descriptor
DTC C0131 00
- ABS Pressure Circuit




Circuit/System Description

The electronic brake control module (EBCM) uses input from the brake pedal position sensor for more accurate control during a Vehicle Stability Enhancement System (VSES) event.


Conditions for Running the DTC

* System Voltage is above 9 volts.
* DTC C0870 is not set.
* The ignition is ON.
* The vehicle speed is greater than 40 km/h (24 mph).



Conditions for Setting the DTC

* Voltage at the pressure sensor signal output to the EBCM falls outside the 0.25-4.75 voltage range for more than 100 milliseconds.
* Brake signal does not correlate to pressure signal.
* Signal is erratic and changes faster than physically allowed.



Action Taken When the DTC Sets

If equipped, the following actions occur:

* The EBCM disables the ABS/traction control system (TCS)/VSES for the duration of the ignition cycle.
* The Traction Control indicator turns ON.
* The driver information center (DIC) displays the Service Stability System message.
* A malfunction DTC will set.
* The ABS indicator turns ON.
* The stability OFF indicator turns OFF.
* The red BRAKE warning indicator could turn ON.



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.



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

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 Verification

1. Verify that DTC C0277, C0297, or B3445 is not set.

• If any of the DTCs are set, refer to

2. Ignition ON, observe the scan tool BPP parameter while applying and releasing the brake pedal. The reading should change between Applied and Released.

• If the parameter does not change between applied and release, replace the BPMV and verify DTC does not reset. 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 (Service and Repair).
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming