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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0171, P0172, P0174, or P0175 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following system/component:
    • B52 Heated Oxygen Sensor
    • B66 Intake Air Temperature Sensor
    • B74 Manifold Absolute Pressure Sensor
    • B75C Multifunction Intake Air Sensor
    • B150 Fuel Tank Pressure Sensor
    • Q12 Evaporative Emission Purge Solenoid Valve
    • Q17 Fuel Injector
    • Q38 Throttle Body
    • Engine Misfire
    • Go to next step: If a related DTC is not set 
  3. 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.

    Verify DTC P0171, P0172, P0174, P0175 is not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If no DTC is set 
  4. All OK.
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