The engine P1726 Code is meaningful and all meanings are found from various sources. You must collect the right meaning of the car engine code what is found from the car manufacturer. The automobile dictionary meaning of the code can be used for solving the car engine and that meaning is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 6 for Cruise Control System – Vehicle Accel Too High. You must fix the car engine using any right meaning of the code.