U0119Lost Communication With Fuel Cell Control Module
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0119 is the slot for losing the fuel cell control module, the controller that runs the hydrogen stack of a fuel cell vehicle: air compressor, hydrogen supply, humidity, stack cooling and the electrical output handed to the drive. Older code tables still label U0116–U0120 as reserved, so some scan tools show no text for it. No manufacturer documents the code publicly; Toyota, Hyundai and Honda have sold series fuel cell cars, yet their service data are not open. As a general frame, CARB asks for a dedicated code whenever a digital partner falls silent. U0468 covers invalid data from the same module, U0293 the hybrid/vehicle system controller. Once the link drops, the vehicle controller cannot request stack power: expect a system warning, operation only from the buffer battery or no READY.
- What you may notice
- Fuel cell or drive system warning
- Power limited to the buffer battery
- Vehicle does not reach READY
- Likely causes
- LikelyFuel cell controller without 12 V supply or ground
- PossibleDamaged CAN wiring or connector between stack controller and vehicle controller
- PossibleSoftware fault or missing update in one of the controllers
- RareFuel cell control module internally faulty
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.