Another computer on the network has stopped hearing the engine computer. The driver may notice several warning lights, a no-start or limited power.
Likely causes, most common first
- Weak battery or poor power supply to the engine computer
- Damaged CAN wiring or connector
- Poor ground at the engine computer
- Faulty engine computer
Parts usually involved
- Battery
- CAN wiring
- Ground cables
- Engine computer
Test before you replace
Check battery voltage and the engine computer's power and grounds, then measure the CAN bus lines and resistance.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.