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PRE-RELEASE

DTC C0274, C0275, or C0280

DTC C0274, C0275, or C0280

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 Descriptors

DTC C0274 54

Isolation Valve High Temperature

DTC C0275 54

Dump Valve High Temperature

DTC C0280 54

Stability System Active Too Long High Temperature

Circuit/System Description

The solenoid valves are integral parts of the brake pressure modulator valve assembly. The brake pressure modulator valve assembly contains an isolation solenoid valve and a dump solenoid valve for each wheel and a traction control/stability control supply solenoid valve and isolation solenoid valve for each brake circuit. The solenoid valves are not engaged during normal system operation. When the ABS, traction control or stability control operation is required the electronic brake control module (EBCM) turns the required solenoid valves ON.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

Calculated solenoid valve temperature is greater than threshold.

Action Taken When the DTC Sets


C0274 54 or C0275 54

• The EBCM disables the ABS, traction control, stability control and hill start assist for the duration of the ignition cycle.

• The ABS indicator turns ON.

• The traction control/stability control-active indicator turns ON.



C0280 54

• The EBCM disables the stability control and hill start assist for the duration of the ignition cycle.

• The traction control/stability control-active indicator turns ON.


Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Diagnostic Aids

DTCs can set because of extended operation of ABS, traction control or stability control.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Inlet, Outlet, Isolation, and Prime Solenoid Valve Feedback parameters. The readings should be Inactive.

Circuit/System Testing


1. Ignition ON, verify that DTC C0187, C0196, C019B, or C0710 is not set.

2. If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose that DTC prior to this diagnostic.

3. Ignition OFF, allow the hydraulic Q5 brake modulator valve assembly to cool down to ambient temperature.

4. Ignition ON, verify that DTC C0274 54, C0275 54, or C0280 54 is not set.

5. If a DTC has been stored, replace the EBCM K17. Confirm that the DTC has not been stored again. If the DTC resets, replace the Q5 brake pressure modulator valve assembly.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Electronic Brake and Traction Control Module with Brake Pressure Modulator Valve Replacement

• Control Module References for EBCM replacement, setup and programming


PRE-RELEASE