You need to solve the car engine problem and you should fix the car engine by the meaning of the car engine P2635 Code. It helps to identify the problem and according to the meaning of the code, it is easy to solve the car engine problem. You may learn some information about the car engine problem by the automobile dictionary meaning and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 6 for Vehicle Speed Control And Idle Control System. 3 for Cruise Control Servo Indicates Low and 5 for Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit.