The engine P217C Code is found online and it is necessary thing. The automobile meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 1 for Transmission. 7 for Vehicle Speed Output Circuit and C for TFP Valve Position Switch-Drive Without Drive Ratio. The engine P217C OBD2 reports a sensor liability, extra of the sensor is unlikely to tenacity the underlying problem. The fault is the most likely to be produced by the systems that the sensor is monitoring, but might even be produced by the cabling to the sensor itself.