C0201

DTC C0201

DTC Descriptor

DTC C0201
Antilock Brake System (ABS) Enable Relay Contact Circuit

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

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 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)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.
^ The ABS indicator turns ON.
^ The Traction Control indicator turns ON.
^ The driver information center (DIC) displays the SERVICE ABS/TRACTION message.
^ The DIC displays the PANIC BRAKE ASSIST 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
ABS Schematics

Connector End View Reference
ABS Connector End Views

Electrical Information Reference
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Scan Tool Reference
Scan Tool Data List

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
1. Test for an open or a short to ground in the solenoid valve battery positive voltage circuit. Verify no open or a short to ground is found.
^ If open or a short to ground is found repair circuit.

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

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for EBCM replacement, setup, and programming