C120E

DTC C0201, C120D, or C120E

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (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 Descriptors
DTC C0201 04
- Antilock Brake System (ABS) Enable Relay Contact Circuit Open

DTC C120D
- Antilock Brake System (ABS) Enable Relay Contact Circuit Open

DTC C0201 0E
- Antilock Brake System (ABS) Enable Relay Contact Circuit Resistance Below Threshold

DTC C120E
- Antilock Brake System (ABS) Enable Relay Contact Circuit Resistance Below Threshold

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

C0201 04 or C120D
* Ignition voltage is greater than 10 volts.
* The solenoid relay is commanded ON.

C0201 0E or C120E
* Ignition voltage is greater than 10 volts.
* The solenoid relay is commanded OFF.

Conditions for Setting the DTC

C0201 04 or C120D
* The EBCM detects an open in the circuits to the solenoid valve relay.
* The EBCM detects a stuck open solenoid valve relay.

C0201 0E or C120D
* The EBCM detects an short to battery in the circuits to the solenoid valve relay.
* The EBCM detects a stuck closed solenoid valve relay.

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS) and the 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 40 consecutive drive cycles.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
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

Verify that DTC C0201, C120D, or C120E is not set.

If DTC is set replace EBCM.

Repair Instructions

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

Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming