Code U3553 indicates a communication or electrical circuit failure related to the control valve for hydrogen storage tank B. This prevents the vehicle's control module from properly managing the flow of hydrogen from that specific tank to the fuel cell stack.
The internal electrical windings or solenoid within the valve have failed, creating an open or short circuit.
The wiring between the control module and the valve is chafed, broken, or shorted to ground.
Moisture or contaminants in the valve connector have increased resistance or broken the electrical connection.
The power circuit providing current to the valve actuator has been interrupted by a failed fuse or relay.
The module responsible for sending the control signal to the valve is malfunctioning.
The main engine computer has a failed output driver for the valve circuit.
No, U3553 is a circuit and communication code; it refers to the electrical control of the valve, not a physical leak in the tank.
No, this is rarely the cause. Most U3553 faults are found in the valve actuator or the wiring harness; the PCM should only be considered after all wiring and components are verified.
No, refueling station compatibility does not affect the internal electrical circuit of the tank B control valve.