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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Secondary And Configurable Customer Controls) >> Diagnostic Information and Procedures >> Drive Mode Switch Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that no DTCs are set, except P159F, P15A0 or P15A1.
    • Go to next step: If only DTCs P159F, P15A0 or P15A1 are set 

      Go to next step: Refer to Circuit/System Testing.

    • Go to next step: If no DTCs are set 
  2. All OK.
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