What does code P3479 mean?

Q: What does code P3479 mean?

Cylinder 10 Exhaust Valve Control Circuit Low. P3479 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the electrical circuit that controls the exhaust valve for cylinder 10. This circuit typically operates a solenoid or actuator that adjusts exhaust flow, and a low signal means the PCM sees voltage below the expected range, which can prevent the valve from functioning correctly.

DTC codes / P34xx · Auxiliary emission controls / P3479

P3479Cylinder 10 Exhaust Valve Control Circuit Low

P3479 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the electrical circuit that controls the exhaust valve for cylinder 10. This circuit typically operates a solenoid or actuator that adjusts exhaust flow, and a low signal means the PCM sees voltage below the expected range, which can prevent the valve from functioning correctly.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.