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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0422 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system :
    • B9 Ambient Air Temperature Sensor
    • B34 Engine Coolant Temperature Sensor
    • B75C Multifunction Intake Air Sensor
    • B131 Exhaust Temperature Sensor
    • B136 Exhaust Particulate Matter Sensor
    • Q14 Exhaust Gas Recirculation Valve
    • Q17 Fuel Injector
    • Engine Control Module
    • 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 the DTC does 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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