OBD-II code · Network (extended)
U3550 Hydrogen Tank A Valve Control Circuit
Hydrogen Tank A Valve Control Circuit: the control circuit has an electrical fault.
Is it safe to drive with U3550?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyValve solenoid 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
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- H2 Tank A Valve, Valve Wiring
Related codes
- U3553Hydrogen Tank B Valve Control Circuit
- U3556Hydrogen Tank C Valve Control Circuit
- U354DHydrogen Tank B Temperature Sensor 2 Circuit
- U354EHydrogen Tank C Temperature Sensor 1 Circuit
- U354FHydrogen Tank C Temperature Sensor 2 Circuit
- U3551Hydrogen Tank A Valve Enable Circuit
- U3552Hydrogen Tank A Valve Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.