U0055 — Communication problem on vehicle data network
The vehicle's communication network is experiencing a fault, causing modules to lose connection or send corrupted data. This can happen due to wiring issues, faulty control modules, or network interference. It affects how different systems in the car talk to each other, which can lead to malfunctions or warning lights.
Common causes
The cause is almost always one of a few things. Here they are — U0055 rarely comes from anything outside this list:
- Damaged or corroded wiring/connectors in the communication bus
- Faulty control module causing network errors
- Poor grounding or battery voltage problems
- Interference from aftermarket electronics
- Software glitches in vehicle modules
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Check and repair wiring and connectors for damage or corrosion
- Inspect and test grounding points and battery voltage
- Scan and update module software if available
- Replace faulty control modules if identified
- Clear codes and test drive to confirm repair
That is what holds for U0055 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
Free with an account: 4 questions per day · drawings are Pro. Signing up takes twenty seconds and needs no card.
Code breakdown
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →