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HOMESERVICE MANUALSBUICK2015REGAL BASE, 2.0L ENG VIN X, AWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC P0571: CRUISE CONTROL BRAKE SWITCHCIRCUIT/SYSTEM VERIFICATION
2015 Buick Regal Base, 2.0L Eng VIN X, AWD

Circuit/System Verification

2015 Buick Regal Base, 2.0L Eng VIN X, AWDSECTION Circuit/System Verification
  1. Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are set.
    • If no brake pedal position sensor related DTCs are set 
  2. Verify that no DTCs are set, except DTC P0571.
    • If only DTC P0571 is set 
  3. Replace the K20 Engine Control Module.
  4. Verify DTC P0571 does not set when operating the vehicle within the conditions for running the DTC.
    • If the DTC sets 

      Replace the K9 Body Control Module.

    • If the DTC does not set 
  5. All OK.
RENDER: 1.0x

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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.