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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 139 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0449-P3436) And Symptoms) >> Diagnostic Information and Procedures >> DTC P157A >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:
    • An open on this circuit may cause DTC U18A2 to set. If any other DTC is set, diagnose that DTC first.
  1. Ignition ON, observe the scan tool DTC information. Verify DTC P157A is not set.
    • If DTC P157A is set 

      Refer to Circuit/System Testing.

    • Go to next step: If DTC P157A is set 
  2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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