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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P158A >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no other DTCs set, except for DTC P158A.
    • Go to next step: If no other DTCs are set 
    3. NOTE:

    During the programming procedure, follow the Service Programming System (SPS) prompts for the correct ignition switch position.

  3. Reprogram ECU - - K9 Body Control Module & K20 Engine Control Module
  4. Operate the vehicle within the Conditions for Running the DTC. - Verify the DTC does not set.
    • Go to next step: If the DTC is not set 
  5. All OK.
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