The automobile mobile meaning of the engine P216D Code is not helpful and do not try to use this meaning for solving the car engine. The general meaning of the code is p for Powertrain Code – Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 1 for Fuel And Air Metering. 6 for Vehicle Speed Output Circuit and D for TFP Valve Position Switch-Drive Without Drive Ratio. Find the real meaning of the code from the car engine manual. Do not allow wrong meaning of the engine code for fixing the car engine problem.