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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P20E8 or P20E9 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify the condition does not exist: Contamination - Emission Reduction Fluid - Refer to: Contaminants-in-Diesel Exhaust Fluid Diagnosis
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  2. Perform the scan tool control function: Reductant System Leak Test

    Verify the condition does not exist: Hoses / Lines - Leaking

    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Remove the component: Q61 Reductant Injector - Leave the reductant line and the electrical connector connected.
  4. Place the injector into a suitable container.
  5. Perform the scan tool control function: Reductant System Leak Test

    Verify the condition does not exist: Reductant Injector - Leaking

    • If a condition exists 

      Replace the component: Q61 Reductant Injector

    • Go to next step: If no condition exists 
  6. Perform the scan tool control function: Reductant System Leak Test

    Verify the scan tool parameter: Reductant Pressure = 450 to 550 kPa (65 to 80 PSI)

    • If not between 450 and 550 kPa (65 and 80 PSI) 

      Replace the component: A38 Reductant Pump and Sensor Assembly

    • Go to next step: If between 450 and 550 kPa (65 and 80 PSI) 
  7. All OK.
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