You need to know the cause of the car engine problem. That is why, you have to test the car engine. When the car engine is tested, the car engine P1261 Code is found. This engine code has many meanings and right meaning of the code get highest priority but you can use the automobile dictionary meaning of the code when the real meaning of the code is not found. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 6 for Control Module Throttle Actuator Position Performance and 1 for TFP Valve Position Switch-Drive Without Drive Ratio.