The general meaning of the car engine P2691 Code lets you know the problem of the car engine and location of the problem. The automobile dictionary meaning of the code lets you know the general information of the car engine problem. The general meaning of the car engine 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 1 for TFP Valve Position Switch-Drive Without Drive Ratio. When the car engine is ok, you can test the car engine by a test drive.