● Fix soon
Usually drivable for a short time, but check it soon. It can get worse.
Usually drivable for a short time, but check it soon. It can get worse.
Another computer on the network has stopped hearing the engine computer. The driver may notice several warning lights, a no-start or limited power.
Guided check
- Is the battery voltage low or are the battery terminals loose?If yes: Fix the power first and clear the code. Low voltage can set many network codes.
- Are the engine computer fuses, power or earth faulty?If yes: Repair the supply before suspecting the computer.
- Is the network wiring out of the maker's values when measured?If yes: Find the damaged wire or connector using the wiring diagram.
These checks are general and are still being reviewed by working mechanics.
Causes vary by car. Test before you order a part.
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 Find at suppliers
- CAN wiring Find at suppliers
- Ground cables Find at suppliers
- Engine computer Find at suppliers
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.