Diagnostic Aids
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.
This DTC has a higher priority over any misfire DTC. Diagnose the fuel system, not the ignition system.
Verify the condition did not cause the DTC to set:
- Q17 Fuel Injector = Blocked / Restricted
- Q17 Fuel Injector / Circuit = High Resistance
- System Voltage = Low - Cold Start-Up