The automobile dictionary meaning of the car engine P2258 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 5 for TP Sensor Learn Not Complete and 8 for PCM Stack Overrun. The car P2258 engine code is a kind of powertrain problem and this problem is very easy to solve and do not need to change any component from the car engine for solving the powertrain or the car engine. When the car engine is ok, then it is considered as safe.