U3572Stack Outlet Coolant Temperature Sensor 2 Circuit
- Generic OBD-II code · Network
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- U3572 is logged when the second coolant temperature sensor at the stack outlet has a wiring or signal problem. No maker explains in public why two sensors share this spot; mutual checking is the obvious reason. A Toyota patent for systems with several stacks shows one way: outlet temperature is estimated from inlet temperature and stack output, and an outlet sensor whose reading departs from that estimate is reported as faulty. GM compares the outlet value with an expected figure to spot a failed coolant pump and may then lower stack output. Hyundai campaign 21-01-045H-1 for the Nexo shows that a stack coolant fault (pump code P1D3D94) lights the check engine lamp. No maker documents U3572 publicly. With sensor 1 still valid a warning may be all; with both lost, power will be cut. Sensor 1 is U3571.
- What you may notice
- Fuel cell system warning, MIL on
- Little or no change in driving as long as sensor 1 is valid
- Reduced power if both outlet sensors are affected
- Likely causes
- LikelyOpen, short or corrosion in wiring or connector of outlet sensor 2
- PossibleOutlet temperature sensor 2 faulty internally
- RareShared sensor ground faulty (often with U3571 at the same time)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.