Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 GMC Sierra 3500 HD, 2015 GMC Sierra 2500 HD, 2015 GMC Sierra 1500, 2015 Chevrolet Silverado 3500 HD, and 2015 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON.
- Verify DTC U0078 is not set.
- If DTC U0078 is set
Refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .
- If DTC U0078 is not set
- If DTC U0078 is set
- All OK