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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Intake Air Temperature Signal Modification System Diagnosis >> 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.
    NOTE:

    Verify that adequate fuel is in the fuel tanks before proceeding.

  1. Verify the following DTCs are not set.
    • P0111, P0112, P0113, P0114, or P069E (ECM)
    • P1111, or P1127 (FICM)
    • Go to next step: If none of the DTCs is set 
  2. Engine idling for at least 2 minutes after the ECT scan tool parameter is at least 65°C (149°F).
  3. Verify the vehicle is operating in CNG mode.
    • If not in CNG mode 

      Refer to Circuit/System Testing.

    • Go to next step: If in CNG mode 
  4. All OK.
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