Circuit/System Verification
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On/Vehicle - In Service Mode
- Verify no other DTCs are set.
- If other DTCs are set
- Go to next step: If no DTC is set
- Refer to Circuit/System Testing.