Network
generic or reserved
U3555
Hydrogen Tank B Valve Performance
Hydrogen tank A valve does not open or close as commanded — mechanical failure detected via downstream pressure feedback.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 55
Possible causes
- Valve stuck mechanically high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–3000 €
- Estimated time: 2–8 h
- Component: h2 tank b valve
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012