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DTC C0280

DTC 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 Descriptor

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

Stability control is active for more than 15 s.

Action Taken When the DTC Sets


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

• The EBCM disables the stability control for the duration of the ignition cycle.


Conditions for Clearing the DTC


• The DTC is cleared when the diagnosis runs without errors

• The DTC in the history is deleted after 40 consecutive fault-free ignition cycles.


Diagnostic assistance

This DTC can be generated 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 Testing


1. Ignition ON.

2. Confirm that DTC C0186, C018B, C0196, C019B, C0287 or C0710 are not set as active DTCs.

3. If any of the specified DTCs has been triggered:

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

5. If none of the specified DTCs have been triggered:

6. Switch OFF the ignition and allow the Q5 brake pressure modulation valve unit to cool to outside temperature.

7. Switch ON the ignition and check that the DTC C0280 54 is not set when the car is run under normal braking conditions.

8. If DTC is generated:

8.1. Replace the K17 electronic brake control module (EBCM).

8.2. Verify that the DTC is not set when the car is run under normal braking conditions.

8.3. If DTC is generated, replace the Q5 brake pressure modulation valve unit.

8.4. If DTC is not generated:

8.5. All OK

9. If DTC is not generated:

10. All OK


Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.


• Brake Pressure Modulator Valve Replacement

• Control Module References for replacement, programming and setup of the electronic brake control module (EBCM).