2018 Buick Regal BaseFACTORY OEM SERVICE PROCEDURE

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.
    • 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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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