Device Cannot Communicate With ECM
- Install battery charger
- Unhook any aftermarket electronics (including stereo)
- 2001-2005 Duramax - unhook INFO FUSE, and RADIO FUSE. If the vehicle has TBC BATTERY and TBC IGNITION disconnect those fuses as well.
- If none of the above works, contact Tech Support with a laptop setup at the vehicle with Anydesk installed from Anydesk.com.