What does code U356D mean?

Q: What does code U356D mean?

Anode Header Drain Valve. The U356D code indicates that the vehicle's control module has detected a fault within the anode header drain valve circuit, which is part of the fuel cell or hydrogen system on vehicles equipped with that technology. The computer monitors the valve's electrical circuit and recognizes an abnormal condition such as an open, short, or performance deviation from expected values.

DTC codes / U35xx · Network communication / U356D

U356DAnode Header Drain Valve

The U356D code indicates that the vehicle's control module has detected a fault within the anode header drain valve circuit, which is part of the fuel cell or hydrogen system on vehicles equipped with that technology. The computer monitors the valve's electrical circuit and recognizes an abnormal condition such as an open, short, or performance deviation from expected values.

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.