C0179

DTC C0179

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (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 Descriptor
DTC C0179 00
- System Thermal High

DTC C0179 54
- System Thermal Temperature Hight




Circuit/System Description

The electronic brake control module (EBCM) monitors how often the traction control system (TCS) activates 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°C (428°F).


Action Taken When the DTC Sets

* The EBCM disables the TCS for the duration of the ignition cycle.
* The traction control off indicator illuminates.



Conditions for Clearing the DTC

* After the solenoid valves have cooled the EBCM automatically re-enables TCS function.
* The EBCM automatically clears a 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 (Except JL7) (Antilock Brake System Schematics (Except RPO JL7))Antilock Brake System Schematics (JL7) (Antilock Brake System Schematics (With RPO JL7))
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Without JL7) (ABS Description and Operation (Without RPO JL7))ABS Description and Operation (With JL7) (ABS Description and Operation (With RPO JL7))
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 EBCM


Circuit/System Testing

Important: Allow the brakes to cool down before performing this test.



1. With a scan tool, clear the DTC.
2. With a scan tool connected, test drive the vehicle under normal braking conditions and without causing TCS or ABS activation. Verify DTC C0179 does not reset.

• If DTC C0179 resets, replace the EBCM.

3. Refer to Diagnostic Aids.



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.