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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 P122D >> 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 DTC P02E0 - P02E5, P02E8, P02E9, P02EB, P122B, P122C, P16A0 - P16A2 is not set.
    • Go to next step : If the DTC is not set 
  3. Clear the DTCs.
  4. Ignition Off - For greater than 1 min
  5. Ignition - On / Vehicle - In Service Mode
  6. Verify DTC P122D is not set.
    • If the DTC sets 
    1. Ignition/Vehicle - Off
    2. Verify the following conditions do not exist : Blade @ Q20 Intake Air Flow Valve
        WARNING:

        Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

      • Binding or Sticking @ Open/Close - Position
      • Closed @ Engine Off
      • Coking/Debris / Dirty / Visible Damage
      • Open/Close - Without spring pressure
      • Water intrusion - Ice

        Refer to : Diagnostic Aids

      • If a condition exists - Repair or replace as necessary
    • Go to next step : If the DTC does not set 
  7. 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 

      Repeat step 2

    • Go to next step : If the DTC does not set 
  8. All OK.
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