The car engine P1131 Code is found when the car engine is checked. The car engine is easy to fix and you can fix the car engine by an automobile engineer. The powertrain problem is located here and it needs to fix fast. The automobile dictionary meaning of the code is found online and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 1 for Transmission. 3 for Cruise Control Servo Indicates Low and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. You must not use this meaning in wrong way.