The P2170 engine code is a kind of powertrain problem and it is necessary to fix the problem as soon as possible. Deactivation of cylinders is the best process what realized by discharging a synchronizer pin that generally interlocks the rocker arms and cam follower. The car engine P2170 code tenacities the synchronizer pin what is unconfined by using hydraulic compression which is measured by an enthusiastic solenoid. If you know how to solve the car engine problem and you have all necessary tools, you can try to solve the car engine in your place. Do not drive the car until the car engine is ok.