U2103 — 19 documented meanings by make
Documented by: CHEVROLET (USA), OPEL / VAUXHALL, SAAB, SUZUKI — the meaning can differ between manufacturers
U2103 does not mean the same thing on every car — manufacturers reuse the number for different faults. 4 makes document it: Chevrolet (USA), Opel / Vauxhall, Saab, Suzuki. Find your make below.
| Make | Documented meaning | Points at |
|---|---|---|
| Chevrolet (USA) | Fewer controllers on bus than programmed | |
| Opel / Vauxhall | CAN-BUS error | |
| Opel / Vauxhall | Torque signal, CAN | |
| Opel / Vauxhall | CAN-BUS reset counter overrun | |
| Opel / Vauxhall | CAN-BUS node, no communication | no signal |
| Opel / Vauxhall | Engine torque request signal CAN-BUS | |
| Opel / Vauxhall | CAN-BUS no communication with ABS/TC | ABS / wheel speed · no signal |
| Opel / Vauxhall | No communication with CAN-BUS, high/low speed | CAN bus communication · signal too low |
| Opel / Vauxhall | CAN-BUS no communication with transmission control module, TCM | transmission · no signal |
| Saab | DSM missing on BUS | |
| Saab | SPA missing on BUS | |
| Saab | PSM missing on BUS | |
| Saab | ECM missing on BUS | control module |
| Saab | PAS missing on BUS | |
| Saab | TPMM missing on BUS | |
| Saab | AHM/PHM missing on BUS | |
| Saab | TCS/ESP missing on BUS | ABS / wheel speed |
| Saab | Electric hydraulic power steering, EHPS, missing on BUS | steering |
| Suzuki | Control module communication bus off | control module |
U2103 on Opel / Vauxhall
On Opel / Vauxhall vehicles U2103 is documented as: CAN-BUS error; Torque signal, CAN; CAN-BUS reset counter overrun; CAN-BUS node, no communication; Engine torque request signal CAN-BUS; CAN-BUS no communication with ABS/TC; No communication with CAN-BUS, high/low speed; CAN-BUS no communication with transmission control module, TCM.
Related Opel / Vauxhall codes:
U2103 on Saab
On Saab vehicles U2103 is documented as: DSM missing on BUS; SPA missing on BUS; PSM missing on BUS; ECM missing on BUS; PAS missing on BUS; TPMM missing on BUS; AHM/PHM missing on BUS; TCS/ESP missing on BUS; Electric hydraulic power steering, EHPS, missing on BUS.
Related Saab codes:
U2103 on Suzuki
On Suzuki vehicles U2103 is documented as: Control module communication bus off. U2103 points at control module. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Suzuki codes:
Which one is yours
A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:
- Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
- Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
- Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
- If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.
That is what holds for U2103 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 →