What does code P349F mean?

Q: What does code P349F mean?

Cylinder 8 Deactivation/Intake Valve Performance. P349F indicates that the powertrain control module has detected a performance fault in the cylinder 8 deactivation or intake valve control system, meaning the engine cannot properly switch that cylinder between active and deactivated states. The computer monitors valve lift and response time and sets this code when the expected change does not occur within the calibrated window.

DTC codes / P34xx · Auxiliary emission controls / P349F

P349FCylinder 8 Deactivation/Intake Valve Performance

P349F indicates that the powertrain control module has detected a performance fault in the cylinder 8 deactivation or intake valve control system, meaning the engine cannot properly switch that cylinder between active and deactivated states. The computer monitors valve lift and response time and sets this code when the expected change does not occur within the calibrated window.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.