U354CHydrogen Tank B Temperature Sensor 1 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U354C flags the circuit of the first temperature sensor in tank B. The maker decides which tank is B, and every series fuel cell car has at least two: the first Mirai carried tanks of 60.0 and 62.4 litres, the Clarity a main and a sub tank. With several tanks the readings can be checked against each other. A Hyundai patent monitors the sensors of three tanks, judges one defective once it sits 20 °C away from the others and replaces its value with a healthy one, so fill control still respects 85 °C and the fuel quantity stays right. Such comparison targets drifting values; an open or shorted sensor as in U354C is recognised directly. No maker documents the code. Sensor 2 of tank B is U354D.
- What you may notice
- Hydrogen system warning
- Refuelling limited or interrupted
- Likely causes
- LikelyOpen or short in the wiring to tank B
- PossibleTemperature sensor 1 of tank B failed
- RareInput stage of the storage control unit faulty
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.