Reasons for Volkswagen Lavida 01314 Fault Code?
2 Answers
Possible causes of the fault: 1. The signal between control unit-J104 and the engine control unit is transmitted via the CAN bus, but the software version numbers of control unit-J104 and the engine control do not match. 2. The engine control unit is faulty. 3. The CAN bus is faulty. 4. The two CAN buses have been swapped in position. 5. A control unit that transmits signals via the CAN bus. Extended content, troubleshooting methods: 1. Use the 'Query Software Version Number' function to check the part numbers of these two control units. 2. Verify the part numbers according to the parts catalog. 3. Query the fault memory of the engine control unit. If faults are stored, refer to the corresponding engine repair manual to resolve the faults and clear the fault memory. 4. Check the bus. 5. Check if the bus is incorrectly installed. If the positions are swapped, the control unit cannot receive or send signals.
I've been repairing cars for over a decade, and the 01314 fault code in the Volkswagen Lavida is most likely caused by poor communication with the engine control unit. The most common reasons are a burnt-out power relay or a loose ground wire, which can cause the entire communication system to stall. Corrosion or dust buildup in the wiring connectors can also block signal transmission. This issue is more likely to occur when driving on bumpy roads because vibrations can make the connections unstable. I've fixed several Lavidas with this exact problem—using a diagnostic tool to thoroughly inspect the power supply circuit and replacing the relay usually solves it. If left unchecked for too long, the engine may experience difficulty starting or increased fuel consumption, so it's best to take it to a professional repair shop promptly to avoid bigger issues. If you want to check it yourself, start by inspecting the ECU fuse in the fuse box to see if it's intact.
