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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 207 (Antilock Brake System) >> Diagnostic Information and Procedures >> DTC C127F: Rear Axle Control Signal Message Counter Incorrect >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

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. Verify that no other DTCs are set except for DTC C127F.
    • If only DTC C127F is set 
  2. Replace the K17 Electronic Brake Control Module.
  3. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
    • If DTC sets 

      Replace the K38 Chassis Control Module.

    • If DTC does not set 
  4. All OK.
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