U3564Hydrogen Supply Line A Pressure Sensor 1 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3564 deals with the wiring of pressure sensor 1 on hydrogen supply line A, most likely the medium-pressure section behind the tank regulator; J2012 does not fix the spot. Toyota's patent shows such a layout: a mechanical reducing valve brings tank hydrogen down to roughly 1.1–1.6 MPa, an intermediate pressure sensor watches that section, and the injector then lowers the pressure to about 200–300 kPa for the stack. To find an offset, Toyota closes the tank valve, lets the injector draw the line down until the reducer stands wide open, and compares readings up- and downstream of it. Hyundai's Nexo has two hydrogen pressure sensors, numbered 1 and 2, with their own codes (P315200/P315300) and renewed both in campaign T4E; U3564 itself is in no public document. Without the value, regulator monitoring suffers and power may be limited.
- What you may notice
- Fuel cell system warning, MIL on
- Reduced power
- Fuel cell system may refuse to start
- Likely causes
- LikelyOpen, short or corrosion in wiring or connector of pressure sensor 1
- PossiblePressure sensor 1 faulty internally (maker may supply a revised part)
- Rare5 V supply or ground of the sensor missing
- RareFuel cell control unit faulty or needing a software update
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.