What does code P3490 mean?

Q: What does code P3490 mean?

Cylinder 12 Deactivation/lntake Valve Control Performance. P3490 indicates that the powertrain control module has detected a performance fault in the cylinder 12 deactivation or intake valve control circuit, meaning the engine cannot properly switch that cylinder between active and inactive states. The computer monitors valve lift or oil pressure response and sets this code when the commanded state does not match actual engine behavior within a calibrated time window.

DTC codes / P34xx · Auxiliary emission controls / P3490

P3490Cylinder 12 Deactivation/lntake Valve Control Performance

P3490 indicates that the powertrain control module has detected a performance fault in the cylinder 12 deactivation or intake valve control circuit, meaning the engine cannot properly switch that cylinder between active and inactive states. The computer monitors valve lift or oil pressure response and sets this code when the commanded state does not match actual engine behavior within a calibrated time 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.