C0280

DTC C0274, C0275, or C0280

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions 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. The brake pressure modulator 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 antilock brake system, traction control or stability control operation is required the electronic brake control module turns the required solenoid valves ON.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The calculated solenoid valve temperature is greater than the threshold.

Action Taken When the DTC Sets

C0274 54 or C0275 54

* The ABS indicator turns ON.

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

* The electronic brake control module disables the antilock brake system, the traction control, the electronic stability control and the hill start assist for the duration of the ignition cycle.

C0280 54

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

* The electronic brake control module disables the stability control, the traction control and the hill start assist for the duration of the ignition cycle.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.

* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

This DTCs may set due to extended operation of the antilock brake system, traction control or stability control.

Reference Information

Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

Connector End View Reference

Component Connector End Views Sunshade - Left (DH6)

Description and Operation

ABS Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Note:
Since most occurrences of this DTC are caused by excessive antilock brake system or traction control usage, review with the customer the conditions under which the DTC set.

1. Ignition ON.

2. Verify that DTC C0187, C018B, C0196, C019B, C0287, C0297, or C0710 is not set.

• If any of the DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of the DTCs are set

3. Ignition OFF, allow the hydraulic brake pressure modulator to cool down to ambient temperature, ignition ON.

4. Verify that DTC C0274 54, C0275 54, or C0280 54 are not set while driving the vehicle under normal braking conditions.

• If any of the DTCs are set

1. Replace the K17 electronic brake control module.

2. Verify that DTC C0274 54, C0275 54, or C0280 54 are not set while driving the vehicle under normal braking conditions.

• If any of the DTCs are set, replace the Q5 brake pressure modulator.

• If none of the DTCs are set.

3. All OK.

• If none of the DTCs are set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

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

* Control Module References Control Module References for electronic brake control module replacement, programming and setup