The automobile engine P2648 Code has automobile dictionary meaning and it is not right to use for solving the car engine problem. The powertrain problem is here located and it should be fixed fast. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 6 for Vehicle Speed Control And Idle Control System. 4 for BBV Sensor Circuit Low Voltage and 8 for PCM Stack Overrun. Do not drive the car with the car engine problem and do not fix the car if you do not know how to fix the car engine.