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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 P1255 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON.
  2. Verify DTC P0231, P0232, or P023F is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify that the area where the K111 Fuel Pump Driver Control Module is located is free of debris, clutter, or any insulating material that would cause the fuel pump driver control module to overheat.
    • If any debris, clutter, or other material is found 
    1. Clear the area where the K111 Fuel Pump Driver Control Module is located.
    2. Clear the DTC and test drive the vehicle.
    3. Verify the DTC does not set.
      • If the DTC sets, replace the K111 Fuel Pump Driver Control Module.
      • Go to next step: If the DTC is not set
    4. All OK.
    • Go to next step: If no debris, clutter, or other material is found 
  4. Clear the DTC and test drive the vehicle.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K111 Fuel Pump Driver Control Module.

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