The engine P2690 Code is an important thing and it helps to solve the car engine problem. Fix the car engine by the real meaning and get the automobile dictionary meaning of the code. 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. 9 for Crankshaft Position Sensor Circuit Performance and 0 for Transmission Engaged At High Throttle Angle. Deactivation process of cylinders is reached by releasing a synchronizer pin that normally interlocks the cam follower and rocker arms.