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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0010 To DTC P0442) >> Diagnostic Information And Procedures >> DTC P0171, P0172, P0174 Or P0175: Fuel Trim System >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify no other DTCs are set.
    • Go to next step : If no other DTCs are set 
  3. Verify DTC P0171, P0172, P0174 or P0175 is not set.
    • If a DTC is set 

      Refer to Circuit/System Testing below.

    • Go to next step : If no DTC is set 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
  5. Verify DTC P0171, P0172, P0174 or P0175 is not set.
    • If any of the DTCs set 

      Refer to Circuit/System Testing below.

    • Go to next step : If none of the DTCs set 
  6. All OK.
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