Skip the auto shop - Our mechanics make house calls

P0705 OBD-II Trouble Code: Transmission Range Sensor Circuit Malfunction (PRNDL Input)

Check Engine Light

P0705 code definition

Transmission Range Sensor Circuit Malfunction (PRNDL Input)

What the P0705 code means

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.

There are three types of the Transmission Range Sensors:

  1. The Contact type, which is a simple set of switches that communicate to the ECM the exact shifter level position. This type uses a different wire for each position of the shifter.

  2. The Pressure Range Switch is bolted to the valve body of the transmission. It opens up and closes different passages for the transmission fluid as the shift lever is moved. As the gear position moves, a different passage for the transmission fluid will be activated and sensed by this type of range sensor.

  3. The Variable Resistor form is the third in the Transmission Range Sensor family. It contains a series of resistors tied to the same voltage output. A resistor is designed to absorb a certain amount of voltage. Each gear has its personal resistor in its circuitry and will be used depending on the of the shifter positioning (PRNDL).

What causes the P0705 code?

  • Open or short in the TRS circuit
  • Faulty TRS
  • Faulty ECM or TCM
  • Misadjusted shift linkage
  • Dirty or contaminated transmission fluid
  • Faulty transmission valve body

What are the symptoms of the P0705 code?

  • In some cases the vehicle may experience a no start condition. For the safety of the motorist, the TRS will only allow the vehicle to start in a Park or Neutral position. This feature was added to keep the vehicle from starting unless the owner is behind the wheel and ready to assume full control of the vehicle.

  • The vehicle may not go in or out of gear

  • The vehicle may not shift properly

  • Check Engine Light illumination

How does a mechanic diagnose the P0705 code?

  • Verifies that there is a proper voltage and ground present at the Transmission Range Sensor

  • Tests a Contact form of a TRS: a mechanic will back probe each wire on the sensor while someone else changes the gears, and verifies for correct output. There should be a change in the voltage each time the gear position is changed. The specific voltages can be found through a site such as ProDemand (login required), or you can ask a mechanic.

  • Tests a Variable Resistor form of a TRS: a mechanic will use a multimeter to measure the amount of voltage the reference wire outputs. The reference wire will send a different voltage to the ECM each time it changes gear. If the reference voltage does not change or is nonexistent, the sensor is either bad, or a wire is faulted.

  • Tests a Pressure Range Switch form of TRS: a mechanic will verify which wires are output to ground. Most sensors of this type will use a ground connection as its form of output. As the driver changes gear, the valve body will allow transmission fluid through different passages. As the transmission fluid goes through a different passage the, TRS will output a different ground. To see which ground wire coincides with which gear, an accurate wiring diagram of the sensor must be located. A wiring diagram can be found through a site such as ProDemand, or you can ask a mechanic.

Common mistakes when diagnosing the P0705 code

First, when checking this problem, the transmission fluid should be checked for cleanliness. Dirty or contaminated transmission fluid is the leading cause of most transmission issues

How serious is the P0705 code?

  • It is not too damagingly serious, except that you won’t be able to pass inspection with a Check Engine Light.

  • There may be a no start condition along with the Check Engine Light.

  • Erratic shifting may occur.

  • The vehicle may go into limp mode, leaving you unable to go over 40 MPH.

What repairs can fix the P0705 code?

Additional comments for consideration regarding the P0705 code

It is recommended to check the shift linkage adjustment and the transmission fluid condition before replacing any parts.

Need help with a P0705 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...

Related questions

Q: P0705 - 2007 Scion tC

Hello and thanks for contacting YourMechanic. The code P0705 means the transmission range sensor circuit has a fault. This is usually caused by the sensor on the transmission failing. After installing the remote start switch, if you did not hook...

Q: Check engine light

Hello. I know how frustrating this can be. This needs to be a hands on inspection of the codes and system. We at YourMechanic can have a technician come to you and inspect your vehicle and definitively diagnose the Check...

Q: Performance chip messed up my car

Since I don't know what kind of chip you have or the specifics of how it was installed, I'm not sure how much advice I can provide. But first, I would start by double checking that everything is exactly how...