OBD-II code · Network (extended)
U354A Hydrogen Tank A Temperature Sensor 1 Circuit
Hydrogen Tank A Temperature Sensor 1 Circuit: an electrical fault is present in the circuit.
Is it safe to drive with U354A?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyTemperature sensor failed
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- H2 Tank A Temp Sensor 1, Sensor Wiring
Related codes
- U354BHydrogen Tank A Temperature Sensor 2 Circuit
- U354CHydrogen Tank B Temperature Sensor 1 Circuit
- U354DHydrogen Tank B Temperature Sensor 2 Circuit
- U354EHydrogen Tank C Temperature Sensor 1 Circuit
- U354FHydrogen Tank C Temperature Sensor 2 Circuit
- U3547High Voltage System Interlock Circuit P Low
- U3548High Voltage System Interlock Circuit P High
- U3549Hydrogen Tank High Pressure Sensor 1 Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.