U3575Coolant Mixing Valve Position Sensor Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3575 deals with wiring and signal of the sensor reporting how far the coolant mixing valve is open. GM lists feedback of the valve position, next to two temperature sensors, among the parts its stack outlet temperature control relies on. In Toyota's design the sensor is built into the valve and returns the angle of the valving element; since it can drift, the controller re-zeroes it against an end position before the coolant pump starts. If the signal is missing or shorted, the controller no longer knows where the valve stands and may regulate from temperatures alone or move the valve to a safe setting. No maker documents U3575 publicly. Probable results: a warning lamp and capped output. Faults in driving this valve fall under U3573.
- What you may notice
- Fuel cell system warning, MIL on
- Stack temperature regulated less precisely, reduced power
- Valve opening shown as invalid in live data
- Likely causes
- LikelyOpen, short or moisture in the position sensor wiring or connector
- PossiblePosition sensor faulty (usually replaced together with the valve)
- RareSensor supply or ground missing
- Repair
- Hard · 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.