Circuit/System Testing

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.

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
Perform the scan tool control function: Reductant System Leak Test
Verify the condition does not exist: Leaking - Hoses / Lines
- If a condition exists
  Repair or replace as necessary.
- Go to next step: If no condition exists
Remove the component: Q61 Reductant Injector - Leave the reductant line and the electrical connector connected.
Place the injector into a suitable container.
Perform the scan tool control function: Reductant System Leak Test
Verify the condition does not exist: Leaking - Reductant Injector
- If a condition exists
  Replace the component: Q61 Reductant Injector
- Go to next step: If no condition exists
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)
All OK.