Circuit/System Verification

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 there are no DTCs set related to the following system/component:
- B9 Ambient Air Temperature Sensor
- B34 Engine Coolant Temperature Sensor
- B65 Intake Manifold Pressure and Air Temperature Sensor
- B75C Multifunction Intake Air Sensor
- B115 Vehicle Speed Sensor
- If a related DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If a related DTC is not set
Verify the following conditions do not exist:
- Q20 Intake Air Flow Valve - Binding or Sticking/Restricted
- Air Cleaner Element - Restricted/Saturated with water
- EGR Cooler - Leaking/Restricted
- EGR Valve - Binding or Sticking/Restricted/Visible Damage
- Exhaust Gas Recirculation System - Leaking/Restricted
- Exhaust System - Leaking/Missing components/Restricted/Visible Damage
- Induction System - /Leaking/Restricted - Refer to: Charge Air Cooler Diagnosis (Full System Leak Test) , or Charge Air Cooler Diagnosis (Induction System Smoke Test)
- Mass Air Flow Sensor - Contaminated/Skewed
- Turbocharger - Leaking/Restricted
- If a condition exists
  Repair or replace as necessary.
- Go to next step: If no condition exists
Clear the DTCs.
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: Q14 Exhaust Gas Recirculation Valve
- Go to next step: If no DTC is set
All OK.