U354EHydrogen Tank C Temperature Sensor 1 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U354E points to an electrical fault on sensor 1 of tank C, a tank that exists only on three-tank vehicles: the second-generation Mirai, whose long central tank is joined by two smaller ones crosswise under the rear seat and the boot, or the Nexo with three tanks holding 156 litres. On a two-tank car such as the first Mirai or the Clarity the code would suggest a configuration or software mismatch. The sensor is not the overheat protection: a thermally activated relief device opens on its own, on Toyota's FCHV at 110 °C, without electronics. A lost sensor costs information, not the fire safeguard. No manufacturer documents U354E publicly; sensor 2 of tank C is U354F.
- What you may notice
- Hydrogen system warning
- Refuelling slower or stopped early
- Likely causes
- LikelyWiring or connector fault at tank C
- PossibleTemperature sensor 1 of tank C failed
- RareController coded for a different number of tanks
- 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.