The engine P0820 Code supports you for solving the car engine and find the meaning of the code for solving the car engine. Deactivation of cylinders is achieved by releasing a synchronizer pin that normally interlocks the cam follower and rocker arms. The engine P0820 code resolves the synchronizer pin is unconfined by means of hydraulic compression which is measured by a dedicated solenoid. The powertrain problem of the car engine is not difficult to solve. Do not use wrong meaning of the code for solving the car engine. You need to use real meaning of the code solving the car engine problem.