U0115

What does U0115 mean?

U-code U0115 means "Lost Communication with ECM/PCM E". It is a manufacturer-specific diagnostic trouble code (DTC) in the vehicle network (CAN/LIN bus). A communication failure has been detected — the module responsible for the lost communication with ecm/pcm e is not responding on the vehicle network. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.

Possible Causes

• CAN bus wiring fault (short, open, or termination resistor failure)
• Faulty control module not transmitting on the vehicle network
• Power supply issue preventing the module from initializing
• Software mismatch or corruption in the affected module

Recommended Actions

1. 1 Note the alert and schedule a diagnostic appointment when convenient
2. 2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside U0115
3. 3 Check CAN bus wiring for damage; verify termination resistance (should be ~120 Ω between CAN-H and CAN-L)
4. 4 Verify power supply and ground connections at the affected module
5. 5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
6. 6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement