C0179

DTC C0179

DTC Descriptor
DTC C0179 00
- System Thermal High

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

The electronic brake control module (EBCM) monitors Traction Control System (TCS) activation in order to calculate an estimate of the EBCM solenoid valve temperatures. In most cases high solenoid valve temperatures are caused by extended TCS activation. If the EBCM calculates that the solenoid valve temperatures are too high, the EBCM will temporarily suspend the TCS function until the solenoid valves cool.

Conditions for Running the DTC

* The ignition is ON.
* Ignition voltage is greater than 8 volts.

Conditions for Setting the DTC

The estimated solenoid coil temperature reaches 220 degrees Celsius.

Action Taken When the DTC Sets

* EBCM disables the TCS for the duration of the ignition cycle.
* Traction control warning lamp illuminates.
* Driver information center (DIC) displays the SERVICE TRACTION CONTROL message.

Conditions for Clearing the DTC

* After the solenoid valves have cooled the EBCM automatically re-enables TCS function.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

Most occurrences of this DTC are caused by excessive TCS activation or braking.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System 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 for EBCM

Circuit/System Testing

Note: Allow brakes to cool down before performing test.

1. With scan tool clear the DTC.
2. With scan tool connected test drive the vehicle under normal braking conditions and without causing TCS or ABS activation. Verify DTC C0179 resets.

^ If the DTC resets replace the EBCM.

3. Refer to Diagnostic Aids.

Repair Instructions

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