Do not try to use common meaning of the P20E4 Code for solving the car engine problem. Collet the engine’s real meaning what related with you brand car. You may create more problem if you use dictionary meaning. The dictionary meaning of this code is P for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Transmission e – BBV Sensor Circuit Low Voltage and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. The main problem of the car engine is Powertrain. It is easy to fix at the cheap rate.