P3438

DTC P3438, sometimes indicated as P343800 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 5 exhaust valve control circuit performance.

The exhaust valve control circuit performance code means that the PCM is seeing a problem with the exhaust valve control circuit. This circuit controls the valves that let the exhaust gases escape from the engine.
There are many things that could cause this code, including a broken or damaged part, a wiring issue, or a problem with the PCM.
If you have this code, the best thing to do is to have a certified mechanic inspect your vehicle and determine the cause of the problem.

• P3438: Cylinder 5 Exhaust Valve Control Circuit Performance
• P3438: Exhaust valve control, cylinder 5 – circuit performance
• P3438 00: Exhaust valve control, cylinder 5 - circuit performance