From the engine P1655 Code, you can learn general information and those are p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 6 for Vehicle Speed Control And Idle Control System. 5 for TP Sensor Learn Not Complete and 5 for Park/Neutral Position or PNP Switch Circuit Engine Torque Signal Circuit. You have to deactivate the cylinders what is attained by releasing a synchronizer pin that generally links the cam follower and rocker arms. The engine P1655 code resolutions the synchronizer pin is unconfined using hydraulic pressure which is measured by a dedicated solenoid.