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
- Antilock Brake System (ABS) Enable Relay Contact Circuit




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

One or more of the fallowing conditions exists:

* The EBCM detects an open in the battery positive voltage circuit to the solenoid valve relay.
* The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.



Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS)/traction control system (TCS)/dynamic rear proportion (DRP) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The Traction Control indicator turns ON.
* The red brake warning indicator turns ON.
* The driver information center (DIC) displays the SERVICE BRAKE SYSTEM/TRACTION SYSTEM message.



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.



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

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/System Verification

With the scan tool, access the ABS special functions menu and perform the ABS Motor test. The pump motor should function and no DTCs should be set.


Circuit/System Testing

Test for an open or a short to ground in the solenoid valve battery positive voltage circuit.

If battery positive voltage circuit tests normal, replace the EBCM/BPMV assembly.



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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