What does code U3571 mean?

Q: What does code U3571 mean?

Stack Outlet Coolant Temperature Sensor 1 Circuit. U3571 indicates that the vehicle's control module has detected a fault in the electrical circuit for the stack outlet coolant temperature sensor, which monitors the temperature of coolant exiting the stack (often part of the battery or power electronics cooling loop). The computer compares the sensor signal to expected values and sets this code when the voltage or resistance falls outside the normal range, indicating an open, short, or irrational signal.

DTC codes / U35xx · Network communication / U3571

U3571Stack Outlet Coolant Temperature Sensor 1 Circuit

U3571 indicates that the vehicle's control module has detected a fault in the electrical circuit for the stack outlet coolant temperature sensor, which monitors the temperature of coolant exiting the stack (often part of the battery or power electronics cooling loop). The computer compares the sensor signal to expected values and sets this code when the voltage or resistance falls outside the normal range, indicating an open, short, or irrational signal.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.