P3473 indicates the powertrain control module has detected an open circuit in the intake valve control circuit for cylinder 10, which is part of the variable valve deactivation (VVD) system.
The solenoid that controls the deactivation valve may have failed open, breaking the circuit.
Corrosion, broken wires, or a loose connector can create an open circuit condition.
If the sensor that monitors valve position is shorted or open, the system may register an open circuit.
A fuse that has opened or a relay that has failed can interrupt power to the valve control circuit.
Rarely, the PCM’s driver circuit for the cylinder 10 valve may be damaged, but this is far less common than component or wiring issues.
Replacing the PCM is rarely needed for this code. In most cases the problem lies with the valve actuator, wiring, sensor, or a fuse. PCM replacement should be considered only after exhaustive testing proves the circuit and components are functional.
Clearing the code will turn off the Check Engine Light temporarily, but the underlying fault will cause the code to return as soon as the PCM detects the open circuit again.
The vehicle can usually be driven short distances, but reduced fuel efficiency, power loss, and possible engine vibration make prolonged operation undesirable. It is best to diagnose and repair the issue promptly.
Yes. An open valve deactivation circuit can cause uneven combustion, leading to higher emissions, which may cause the vehicle to fail an emissions inspection.