P0708 - TRANSMISSION RANGE SENSOR "A" CIRCUIT HIGH

POST UPDATED IN November, 2020

Description of DTC code P0708 Generic

The DTC code P0708 OBD2 is set at the moment the Powertrain Control Module (PCM) finds an out-of-range input voltage at the Transmission Range Sensor (TRS).

The TRS Sensor is a switch that rotates completing different circuits according to the position of the moving parts in the switch. Usually, the transmission selector shaft goes through the switch and moves the gear selector, the selector shaft rotates a moving part to complete the particular circuit.

The PCM or TCM uses the TRS Sensor to know the position of the shift lever. If signals are indicating two different shift positions at the same time for more than 30 seconds, this code will be set. If this occurs twice in a row, the Check Engine light illuminates and the transmission is instructed to enter the fail-safe mode.

Symptoms of fault code P0708 Generic

  • Engine check light on.
  • Obvious lack of starting power after a complete stop.

Causes of OBD2 P0708 Generic

The reasons why the fault code P0708 OBDII is configured are

  • A badly adjusted transmission shift rod.
  • The TRS (Transmission Range Sensor) may be defective.
  • Cables related to the sensor in bad condition.
  • There may be an incorrect adjustment of the TRS Sensor.

Possible solutions of the DTC code P0708 Generic

The steps for the proper solution of the diagnostic code P0708 OBD2 are the following:

  • See the TSB (Technical Service Bulletins).
  • Check all the cables to make sure they are in good condition. If there is inconsistency in any of these components, you must make the necessary repairs.
  • With the ignition key and the engine off, use a digital voltmeter to check each return signal circuit individually. You must do this test with the sensor connected. Note that each signal circuit should have the voltage in one position as well as a single position. If a voltage is present in a circuit in more than one position, the TRS Sensor is defective and must be replaced.

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