U3558Hydrogen Tank C Valve
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3558 is listed only as Hydrogen Tank C Valve, without a fault type, so it serves as the general valve code for tank C on three-tank vehicles. FMVSS 308 shows what such a valve must withstand: tens of thousands of pressure cycles, partly at extreme temperatures, chatter flow, and afterwards no more than 10 NmL of leakage per hour. Toyota treats tank and valve as one service part on the Mirai and has it replaced every 15 years. A valve fault on the third tank costs range rather than mobility as long as tanks A and B work. No manufacturer documents U3558 publicly; the diagnosis starts with the freeze frame data and with U3556 and U3557 for the electrical side of the same valve.
- What you may notice
- Hydrogen system warning
- Shorter range
- Likely causes
- PossibleTank C valve sticking or not sealing
- PossibleElectrical fault at the valve without its own circuit code
- RareTank and valve beyond their service life
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.