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Home › GMC › 2018 › Acadia SL › Repair and Diagnosis › External Pages › Different car › Section 249 (Parking Brake System) › Diagnostic Information and Procedures › DTC C056D: Electronic Control Unit Hardware › Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC C056D 36 is not set.
    • If DTC C056D 36 is set 
    1. Program the K83 Parking Brake Control Module.
    2. Ignition ON.
    3. Apply and release the park brake.
    4. Verify the DTC is not set.
      • If the DTC is set, replace the K83 Parking Brake Control Module.
      • If the DTC is not set
    5. All OK.
    • If DTC C056D 36 is not set 
  3. Perform the Parking Brake Motor Reset procedure with a scan tool for the Parking Brake Control Module.
  4. Verify DTC C056D is not set.
    • If DTC C056D is set 

      Replace the K83 Parking Brake Control Module.

    • If DTC C056D is not set 
  5. All OK.
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