The engine P1855 Code is found from the car engine if the car engine is checked. From the car engine code, you can know some information about the car engine. Do not use any wrong meaning of the code for solving the car engine. The Automobile dictionary meaning of the code lets you know information and you can use the meaning. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 8 for Ignition System Or Misfire. 5 for TP Sensor Learn Not Complete and 5 for Park or Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit.