Network
generic or reserved
U356A
Anode Drain Valve Control Circuit
Generic electrical fault on the anode drain valve control. The drain valve releases liquid water and inert gases that accumulate in the anode loop.
SystemNetwork
Typegeneric or reserved
GroupU3
Range / number5 / 6A
Possible causes
- Valve actuator 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: 200–1500 €
- Estimated time: 1–4 h
- Component: anode drain valve
- Component: valve wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012