P0705 Code - Transmission Range Sensor Circuit Malfunction

What does P0705 Mean?

Diagnostic trouble code P0705 indicates that the Engine Control Module (ECM) or Transmission Control Module (TCM) has received an input error from the Transmission Range Sensor (TRS). This switch is also known as a pressure switch, Park Neutral Position switch (PNP), the gear selection switch, or a PRNDL input switch. The function of the Transmission Range Sensor is to tell the ECM or TCM the position of the shift lever. The TRS is most commonly located on the outside of the transmission, however some of them are located inside of the transmission on the valve body.

This particular trouble code will set if the ECM does not receive an input. It also will set if the ECM receives an input that can not be logically possible: for example if the vehicle is going 50 MPH, but the Transmission Range Sensor tells the ECM that it is in Reverse, a code P0705 will set. There also have been instances where a TRS faulted to a point where the ECM was told that it is in more than one gear simultaneously; if this is the case a code P0705 will be set.

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What are the common causes of P0705 ?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.

How do you troubleshoot P0705 ?

The valves of each cylinder are kept closed using a pair of arms that replace the conventional engine's roller-type rocker arm. P0705 code one of these arms follows the cam profile while the second arm connects to the valves. During normal engine operation the two arms are joined by a locking pin.

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