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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P21CB >> 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
  2. Verify that no module communication DTCs are set.
    • Go to next step: If no other DTCs are set 
  3. Verify that DTC P21CB is not set.
    • If a DTC Is set 

      Refer to Circuit/System Testing.

    • 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 from the Freeze Frame/Failure Records data.
  5. Verify that DTC P21CB is not set.
    • If a DTC sets 

      Refer to Circuit/System Testing

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