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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Displays And Gauges) >> Diagnostic Information and Procedures >> Outside Air Temperature Display Malfunction (with LWN/LV1) >> 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 DTC P0072, P0073, or P0074 is not set.
    • If DTC P0072, P0073, or P0074 is set 

      Refer to Circuit/System Testing.

    • Go to next step: If DTC P0072, P0073, or P0074 are not set 
  3. Verify any other ECM or temperature-related DTCs are not set.
    • Go to next step: If no other DTCs are set 
  4. Allow vehicle to completely cool to ambient temperature.
  5. Verify the scan tool Intake Air Temperature parameter is within 15°C (27°F) of actual ambient temperature.
    • If not within 15°C (27°F) of actual ambient temperature 

      Refer to appropriate Intake Air Temperature Sensor diagnosis.

    • Go to next step: If within 15°C (27°F) of actual ambient temperature 
  6. Verify the scan tool ECM Ambient Air Temperature parameter is within 15°C (27°F) of actual ambient temperature.
    • If not within 15°C (27°F) of actual ambient temperature 

      Refer to Circuit/System Testing.

    • Go to next step: If within 15°C (27°F) of actual ambient temperature 
  7. All OK.
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