What does code P349A mean?

Q: What does code P349A mean?

Cylinder 3 Deactivation/Intake Valve Performance. P349A indicates that the powertrain control module has detected a performance fault in the cylinder 3 deactivation system or its associated intake valve control, meaning the engine cannot properly switch cylinder 3 between full operation and deactivated mode. The computer monitors valve lift and response time, and when the expected change does not occur within a calibrated window, it stores this code and may disable the cylinder deactivation feature entirely.

DTC codes / P34xx · Auxiliary emission controls / P349A

P349ACylinder 3 Deactivation/Intake Valve Performance

P349A indicates that the powertrain control module has detected a performance fault in the cylinder 3 deactivation system or its associated intake valve control, meaning the engine cannot properly switch cylinder 3 between full operation and deactivated mode. The computer monitors valve lift and response time, and when the expected change does not occur within a calibrated window, it stores this code and may disable the cylinder deactivation feature entirely.

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.