U3569Anode Multifunction Valve
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- With U3569 the multifunction valve can be driven but does not do what it is told: it stays shut, leaks or reacts too slowly. A solenoid of this kind usually lacks position feedback, so its state is inferred. For an integrated drain and purge valve Hyundai lifts anode pressure a fixed amount over ambient while no current is drawn and the air path is closed, opens the valve and checks after the expected drain time plus a settling period whether pressure has dropped to ambient; if not, the valve counts as stuck closed. GM reads the injector duty instead, which climbs once gas rather than water passes. Stuck shut, the valve lets water flood the anode and nitrogen dilute the hydrogen; stuck open, hydrogen escapes. No public source names U3569. Typical results are a warning, less power or a shutdown.
- What you may notice
- Fuel cell system warning, MIL on
- Reduced power, uneven fuel cell output
- Start refused or shutdown, mainly after frost
- Higher hydrogen consumption
- Likely causes
- PossibleValve frozen shut after parking in frost
- PossibleValve sticking or leaking from deposits or worn seat
- RareWater level sensor of the separator reads wrong, valve itself fine
- RareControl software needs an update
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.