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Home >> Buick >> 2018 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (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 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. 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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