01314 – Engine Control Module: No Communication (VAG Group)
On VAG vehicles, fault code 01314 means "Engine Control Module: No Communication". Below are the real-world causes, step-by-step tests and OEM part numbers.
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01314 quick summary
| Fault code | 01314 |
|---|---|
| Meaning | Engine Control Module: No Communication |
| System | Network / CAN Bus |
| Vehicles | VAG (VW, Audi, Škoda, Seat) |
| Common on | All VAG models – stored in gateway, ABS, instrument cluster or gearbox control units |
| Severity | Medium |
| Can I drive? | If the engine runs normally and the code is old, yes. If the car will not start or warning lights stay on, have it checked before driving. |
| Repair cost | €0 – €800 |
Symptoms of 01314
- Code stored in other modules (ABS, gateway, instruments), not in the engine ECU
- Several warning lights at once (ABS, ESP, EPC)
- Engine cranks but does not start, or stalls
- Sometimes no other symptoms – an old, sporadic entry
Most common causes of 01314 (most likely first)
Mechanic's Pro Tip
01314 is stored by other control units when they cannot hear the engine ECU on the CAN bus. Most of the time it is a one-off caused by low voltage during cranking or a battery change. Clear all codes and see whether it returns. If it does, check the ECU's fuses, power supply and earth, and the CAN wiring and connector at the ECU before suspecting the ECU itself.
1.Low battery voltage during cranking or a battery change
Most likely2.Blown fuse or faulty power supply / earth to the engine ECU
3.Damaged or corroded CAN wiring or ECU connector (water ingress)
4.Faulty engine ECU
5.Faulty gateway module
Step-by-step diagnostic guide
- 1
Scan all modules with VCDS or OBDeleven; check whether the engine ECU (01) can be reached at all.
- 2
Clear all codes, start the car a few times and re-scan to see whether 01314 returns.
- 3
Check the engine ECU fuses and measure its power supply and earth.
- 4
Inspect the ECU connector and CAN wiring for corrosion or water damage.
- 5
Only if supply, earth and wiring are good, test the ECU and the gateway.
Frequently asked questions
Is my engine ECU broken if I see 01314?
Rarely. In most cases it is a one-off communication dropout from low voltage. Only if the ECU cannot be reached at all after the power supply and wiring have been checked is the ECU likely to be at fault.
How much does it cost to fix 01314?
Often nothing – clearing the code is enough. A fuse or wiring repair costs little; repairing or replacing an engine ECU (with coding and immobilizer adaptation) can cost several hundred euros.
Related fault codes
This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.