C0201

DTC C0201

Diagnostic Instructions

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



DTC Descriptor
DTC C0201 04
- Antilock Brake System (ABS) Enable Relay Contact Circuit Open




Circuit/System Description

The solenoid relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids.


Conditions for Running the DTC

* Ignition voltage is greater than 9.5 volts.
* The solenoid relay is commanded ON.



Conditions for Setting the DTC

The EBCM detects no change in voltage when commanding the solenoid valves ON.


Action Taken When the DTC Sets

* The EBCM disables the ABS/dynamic rear proportion (DRP) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The red brake warning indicator turns 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
Description and Operation Reference

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
* Connector Repairs

Scan Tool Reference

Control Module References for scan tool information


Circuit Verification

1. Ignition ON, perform the Solenoid Tests and listen/feel the solenoids clicking.
2. Verify that DTC C0201 is not set.




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



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References for EBCM replacement, setup, and programming