U354BHydrogen Tank A Temperature Sensor 2 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U354B is the circuit code for the second temperature sensor in tank A. One probe cannot capture a long tank during a fast fill: in tests published in the HySafe journal, sensors in on-tank valves at both ends of a Type IV tank finished a fill around 30 °C apart, and the authors concluded that even two positions miss the hottest zone. A second sensor thus gives the controller a cross-check and a second view of the gas. Honda's 2019 dealer notice for the Clarity Fuel Cell describes the flip side: a false reading between two tank sensors kept the tank from being filled completely. No maker documents U354B publicly. With sensor 2 lost, expect a warning and cautious, perhaps incomplete fills; sensor 1 of the same tank is U354A.
- What you may notice
- Tank cannot be filled completely
- Hydrogen system warning
- Likely causes
- LikelyWiring or connector fault at the far tank end
- PossibleSecond temperature sensor of tank A failed
- RareEvaluation software misjudging the sensor pair
- 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.