Lost Communication With Remote Accessory Module

Where it lives

For U0248, start at the module the description names.

Check these first

• Damaged wiring or connectors between the ECM and the remote accessory module
• A failed remote accessory module
• Corrosion or water in the accessory circuit
• A software fault blocking ECM to module communication
• Physical damage that broke the accessory circuit

What to do next

1. Scan the ECM and monitor communication with the remote accessory module
2. Inspect the wiring and connectors between the ECM and the module
3. Check the accessory circuit for water or corrosion
4. Update the vehicle software
5. Replace the remote accessory module if it stays offline
6. Clear the code and retest

Look up another code