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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P127C, P128A-P128D, P128F, P16E4, or P16E5 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON/Vehicle in Service Mode.
  2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify that DTC P0182, P0183, P0187, P0188, P111F, P126E, P126F, P128A, or P128B are not set.
    • If DTC P128A or P128B are the only DTCs set 

      Test or replace the B310 Fuel Pressure/Temperature Sensor.

    • If DTC P0183, P0184, P0187, P0188, P111F, P126E, P126F, P127C, P16E4, or P16E5 is set with any of the DTCs 

      Refer to Circuit/System Testing.

    • Go to next step: If none of the DTCs are set 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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