Learn the meaning of the car engine P2634 Code first and solve the car engine problem. The meaning of the car engine lets you know about the car engine and helps you to solve the car engine. Do not use wrong meaning for solving the car engine. However, you can use automobile dictionary meaning and the automobile dictionary meaning of the code 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 4 for Cruise Vehicle Speed/Set Speed Difference Too High.