Network
generic or reserved
U3550
Hydrogen Tank A Valve Control Circuit
Generic electrical fault on the control circuit of the hydrogen tank A shut-off valve. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 50
Possible causes
- Valve solenoid failed 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 a valve
- Component: valve wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012