This car engine P3449 Code gives you some idea about the car engine problem and that information is not enough to understand the problem of the car engine. That is why, you must check the car engine by a technician who has good knowledge about the car engine problem and its solution. The technician will check the car engine and find the cause of the car engine problem. There are several problems what trigger from the car engine problem of the engine P3449 Code. Those problems are Low oil pressure, Restricted oil passage, Engine mechanical condition, Faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness is open or shorted and Cylinder Deactivation Solenoid circuit poor electrical connection.