The TFP Sensor (Transmission Fluid Pressure) transforms the transmission pressure into an electrical signal which is then sent to the vehicle’s computer through the Controller Area Network (CAN). Once the PCM receives the signal provided by the TFP Sensor, it uses this information to calculate transmission pressure or determine when a shift will occur.
If the TFP Sensor input “A” is not within normal operating voltages, DTC P0843 OBD2 is set.