U0354 — Software Incompatibility With Hybrid/EV Battery Inductive Charger Control Module
U0354 means: Software Incompatibility With Hybrid/EV Battery Inductive Charger Control Module. That is the standard definition — what actually triggered it on a given car depends on the engine.
Code family
U0xxx is communication between control units over the CAN network.
General steps
These apply to most OBD codes and are the right starting point before replacing anything. They are not specific to this code — for that, ask me about your car below.
- Read codes from ALL modules — the U code says which module is not answering; that module usually holds its own code for the cause.
- Check power and ground to the named module (fuse, relay, connector) — lost supply is the usual cause, not the module itself.
- Measure the CAN bus: about 60 Ω between CAN-H and CAN-L with ignition off and battery disconnected; ~120 Ω means a missing terminator.
- Look for corrosion where water gets in: connectors under the seats, the boot lid area, the passenger footwell.
- A weak or old battery sets U codes during cranking — check voltage while starting.
- If the module was replaced recently — it needs coding/adaptation to the car with a brand scanner.
That is what holds for U0354 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.
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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 code meanings come from the SAE/ISO definitions and from what each manufacturer documents for the same code, shown by make. The notes on causes and checks are general guidance built from the code family, not a factory test plan for your car.
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
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