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Circuit/System Testing

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. Verify that no DTCs are present in the ECM.
    • Go to next step: If no DTCs are set 
  2. Replace the K19 Suspension Control Module and verify the DTC does not reset.
    • If the DTC sets 

      Replace the K20 Engine Control Module.

    • Go to next step: If the DTC does not set 
  3. All OK.
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