The meaning of the U1612 Code helpful for solving the car engine and getting the real meaning of the code is necessary. Do not use wrong meaning of the engine code for fixing the car engine problem. You can follow the below ways to fix the car engine if you have all necessary tools for solving the car engine. Deactivation method of cylinders is realized by releasing a synchronizer pin that generally interlocks the cam follower and rocker arms. The engine U1612 code solves the synchronizer pin is out using hydraulic pressure which is measured by a enthusiastic solenoid. It is easy to fix.