The car engine can be fixed if the car engine is tested by the machine and in this case, if you get help from the car engineer or car technician. The car engine P2734 Code is found after the machine test. The general meaning of the code lets you know the meaning of the code for solving the car engine problem. The general meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 3 for Cruise Control Servo Indicates Low and 4 for Cruise Vehicle Speed/Set Speed Difference Too High.