The general meaning of the P2A04 Code is available online and you need to know the manual of the car engine for solving the car engine problem. Do not drive the car if the problem is unsolved. However, the dictionary meaning of this code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific a Computer and Auxiliary Outputs. 0 for IC Circuit High Voltage and 4 for Transmission Control Module Reprogrammable Memory. Now it is easy to fix the car engine problem for the engineer if he knows the real meaning of the code.