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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P045A, P045D, or P1419-P141C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: Q14B Exhaust Gas Recirculation Valve 2
  3. Disconnect the electrical connector: K20 Engine Control Module
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for less than 1 V between the test points: Control circuit terminal 4@Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  6. Test for infinite resistance between the test points: Control circuit terminal 4@Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
  7. Test for less than 2 ohms between the test points: Control circuit terminal 4@Component harness & Terminal 112 X2@ Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms
  8. Test for less than 1 V between the test points: Control circuit terminal 5@Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  9. Test for infinite resistance between the test points: Control circuit terminal 5@Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
  10. Test for less than 2 ohms between the test points: Control circuit terminal 5@Component harness & Terminal 111 X2@Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms
  11. Replace the component: Q14B Exhaust Gas Recirculation Valve 2
  12. Connect the electrical connector: K20 Engine Control Module
  13. 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 

      Replace the component: K20 Engine Control Module

    • Go to next step: If the DTC is not set 
  14. All OK.
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