The automobile dictionary meaning of the P2831 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 8 for Ignition System Or Misfire. 3 for Cruise Control Servo Indicates Low and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. However, meaning of the car engine code is not enough to understand the car engine problem. You should take help from an automobile engineer for solving the car engine problem and he must check the car engine manually as well to find the depth and root of the car engine problem.