The TRS sensor (Transmission Range Sensor) informs the PCM (Powertrain Control Module) of the position of the gear lever. It also allows the engine to start only in neutral positions. The TRS sensor receives a reference voltage from the PCM. The TRS sensor refers a dissimilar voltage to the PCM, depending on which gear the gear lever is in. If the return voltage is not as expected, the diagnostic code P0706 OBDII is established.
This is a code type “C”. It is not emission-related, therefore, the PCM does not activate the engine control light and does not store freeze frame data.