The meaning of this car engine P2749 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 4 for BBV Sensor Circuit Low Voltage and 9 for Kick-Down Switch Failed Short. Here the powertrain of the car engine is faulty and it is necessary to fix this problem as soon as possible. Do not select any meaning of the code for solving the car engine. You may get new problem in the car engine due to use wrong meaning of the code. You must fix the car engine by an expert automobile engineer.