The engine control module has detected an open circuit in the electrical path for the Cylinder 1 intake valve deactivation solenoid. This prevents the vehicle from disabling the first cylinder to improve fuel efficiency during light-load conditions.
An internal break or open winding within the Cylinder 1 solenoid coil.
Frayed, broken, or shorted wires between the PCM and the solenoid connector.
Oxidation or contamination at the solenoid electrical pins causing a loss of continuity.
A blown fuse in the circuit providing power to the cylinder deactivation system.
An internal failure of the driver circuit within the engine control module.
No, P3401 is an electrical circuit code referring to the control solenoid, not a mechanical failure of the intake valve.
Yes, the engine will typically continue to run on all cylinders, but fuel efficiency will decrease because the deactivation system is disabled.
No. It is very uncommon for the PCM to be the cause of this code; the solenoid or the wiring harness is almost always the point of failure.