P3407

DTC P3407, sometimes indicated as P340700 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the auxiliary emissions system causing cylinder 1 exhaust valve control circuit low.

The code P3407 is set when the PCM (Powertrain Control Module) detects a low voltage in the exhaust valve control circuit for cylinder 1. This may be caused by a defective exhaust valve actuator, a defective exhaust valve, a defective PCM, or a wiring problem.
The first step in diagnosing this code is to check the condition of the exhaust valve actuator. If it is defective, the actuator will need to be replaced. If the actuator is okay, the next step is to check the condition of the exhaust valve. If the exhaust valve is defective, it will need to be replaced. If the exhaust valve is okay, the next step is to check the condition of the PCM. If the PCM is defective, it will need to be replaced. If the PCM is okay, the next step is to check the condition of the wiring. If the wiring is defective, it will need to be replaced.

• P3407: Cylinder 1 Exhaust Valve Control Circuit Low
• P3407: Exhaust valve control, cylinder 1 – circuit low
• P3407 00: Exhaust valve control, cylinder 1 - circuit low