Buick Regal Owners & Service Manuals

Buick Regal: 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 Descriptors

DTC C0280

Stability System Active Too Long

For symptom byte information, refer to Symptom Byte List.

Circuit/System Description

The solenoid valves are integral parts of the brake pressure modulator valve. The brake pressure modulator valve contains an isolation solenoid valve and a dump solenoid valve for each wheel and a traction/ 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, the traction control or the stability control operation is required the electronic brake control module turns the required solenoid valves ON.

Conditions for Running the DTC

  • Ignition ON
  • Vehicle speed is greater than 22 km/h (13.7 MPH).

Conditions for Setting the DTC

Calculated solenoid valve temperature is greater than threshold.

Action Taken When the DTC Sets

  • The ABS indicator turns ON.
  • The traction/stability control indicator turns ON.
  • A driver information center message may be displayed.
  • The electronic brake control module disables the ABS, the traction control, the stability 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.

Diagnostic Aids

This DTC may set due to extended operation of the ABS, the traction control or the stability control system.

Reference Information

Schematic Reference

Antilock Brake System Wiring Schematics

Connector End View Reference

Component Connector End View Index

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

NOTE: Since most occurrences of this DTC are caused by excessive ABS, traction control, or stability control usage, review with the customer the conditions under which the DTC set.

1. Ignition ON.

2. Verify that DTC C0186, C0196, C0287, or C0710 is not set.

  • If any of the DTCs are set

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

  • Go to next step: If none of the DTCs are set

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

4. Verify the DTC does not set while driving the vehicle under normal braking conditions.

  • If the DTC sets
  1. Replace the Q5 Brake Pressure Modulator.
  2. Verify DTC C0280 does not set while driving the vehicle under normal braking conditions.
    • If the DTC does set, replace the K17 Electronic Brake Control Module.
    • Go to next step: If the DTC does not set.
  3. All OK.
  • Go to next step: If the DTC does not set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Electronic Brake Control Module replacement, programming and setup.

DTC C0561

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 C0561

System Disabled Information Stored

For symptom byte information refer to Symptom Byte List.

Circuit/System Description

The electronic brake control module disables the electronic stability control when other electronic control modules set DTCs for components that effect the operation of the traction control system.

Conditions for Running the DTC

Engine running.

Conditions for Setting the DTC

The electronic brake control module receives an invalid serial data message from another module more than ten times.

Action Taken When the DTC Sets

  • The ABS indicator turns ON.
  • The traction/stability control indicator turns ON.
  • The electronic brake control module disables the ABS, the traction control, and the electronic stability control for the duration of the ignition cycle.

Conditions for Clearing the DTC

  • The condition for the DTC is no longer present.
  • The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Diagnostic Aids

This DTC indicates there are no problems in the antilock brake system. The body control module, the engine control module, and the transmission control module should be checked for a possible fault first.

Reference Information

Schematic Reference

Antilock Brake System Wiring Schematics

Connector End View Reference

Component Connector End View Index

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

1. Ignition ON.

2. Verify that DTC C0561is not set.

  • If the DTC is set
  1. Reprogram the K17 Electronic Brake Control Module. Refer to Control Module References.
  2. Verity DTC C0561is not set.
    • If the DTC is set, replace the K17 Electronic Brake Control Module.
    • Go to next step: If the DTC is not set
  3. All OK.
  • Go to next step: If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References provides information for control module replacement, programming and setup.

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