How to Solve P0708: Transmission Range Sensor Circuit Low Input

When it comes to car troubles, one of the most frustrating experiences is encountering an error code like P0708. This error code specifically relates to the Transmission Range Sensor Circuit Low Input.

The Transmission Range Sensor (TRS) plays a vital role in the proper functioning of your vehicle’s transmission system. It is responsible for detecting the position of the gear selector and providing necessary information to the engine control module (ECM).

In this article, we will explore the symptoms, diagnosis, and effective DIY solutions to resolve the P0708 error code.


If your vehicle is experiencing the P0708 error code, there are several common symptoms to watch out for. These include:

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  1. Warning light: The check engine light or transmission warning light may illuminate on the dashboard.
  2. Erratic shifting: Your vehicle may exhibit erratic shifting between gears or fail to shift gears properly.
  3. Stuck in gear: You may find your car stuck in a specific gear and unable to shift to other gears.
  4. No start: In some cases, the engine may not start at all due to the error code.
  5. Loss of power: The vehicle may experience a loss of power or struggle to accelerate.


Diagnosing the P0708 error code requires a systematic approach. Before starting the diagnosis, ensure that you have the following tools ready:

  • OBD-II scanner
  • Multimeter
  • Wiring diagram (specific to your vehicle model)

Now, let’s proceed with the step-by-step diagnosis process:

  1. Check the wiring connections: Inspect the wiring connections between the Transmission Range Sensor and the ECM. Look for any loose or damaged connections. Ensure that the wiring harness is securely plugged in.
  2. Test the voltage: Use a multimeter to test the voltage at the Transmission Range Sensor’s input terminal. Follow the wiring diagram to identify the correct terminal. The voltage should be within the specified range. If it is too low or absent, there might be a problem with the sensor or the wiring.
  3. Check for shorts or open circuits: With the multimeter set to the continuity mode, check for any shorts or open circuits in the wiring. Repair or replace any damaged wires as necessary.
  4. Inspect the Transmission Range Sensor: Carefully examine the sensor for any signs of physical damage, such as cracks or corrosion. If any issues are found, replace the sensor with a new one.
  5. Clear the error code: After performing the necessary repairs, use the OBD-II scanner to clear the error code and reset the ECM. Start the engine and check if the P0708 error code reoccurs.


Now that you have diagnosed the P0708 error code, it’s time to implement DIY solutions to resolve the issue. Follow these steps:

  1. Disconnect the battery: Begin by disconnecting the negative terminal of the battery to ensure safety during the repair process.
  2. Locate the Transmission Range Sensor: Refer to your vehicle’s repair manual to locate the Transmission Range Sensor. It is typically situated on the side of the transmission housing.
  3. Remove the old sensor: Carefully remove the old sensor by disconnecting the electrical connector and removing any mounting bolts. Take note of the sensor’s orientation for the installation of the new one.
  4. Install the new sensor: Install the new Transmission Range Sensor in the same orientation as the old one. Ensure a secure fit and reconnect the electrical connector and mounting bolts.
  5. Reconnect the battery: After successfully installing the new sensor, reconnect the negative terminal of the battery.

Useful Tips and Precautions

  • Safety first: Always prioritize safety by disconnecting the battery before performing any repairs.
  • Consult the repair manual: Refer to your vehicle’s repair manual for specific instructions and diagrams related to the Transmission Range Sensor replacement.
  • Quality replacement parts: Purchase a high-quality replacement sensor to ensure optimal performance and longevity.
  • Double-check connections: After the installation, double-check all the connections to ensure they are secure and properly tightened.
  • Clear error codes: Use an OBD-II scanner to clear any stored error codes and reset the ECM after the repair.


Encountering the P0708 error code can be concerning, but with the right knowledge and tools, it is possible to resolve the issue. In this article, we discussed the symptoms, diagnosis, and DIY solutions for the Transmission Range Sensor Circuit Low Input error. By following the step-by-step guide and taking necessary precautions, you can successfully fix the problem and get your vehicle back on the road.


Q: How much does it cost to replace a Transmission Range Sensor?

A: The cost of replacing a Transmission Range Sensor can vary depending on the make and model of your vehicle, as well as the labor costs charged by the repair shop. It is advisable to consult a professional or get a repair quote for accurate pricing.

Q: Can I drive my car with the P0708 error code?

A: It is not recommended to drive your car with the P0708 error code. The error code indicates a problem with the Transmission Range Sensor, which can affect the proper functioning of the transmission system. It is best to address the issue promptly to avoid potential damage.

Q: Can a DIY enthusiast replace the Transmission Range Sensor?

A: Replacing the Transmission Range Sensor can be a moderately challenging task that requires some technical knowledge and tools. If you are an experienced DIY enthusiast and feel confident in your abilities, you can attempt the replacement. However, if you are unsure or uncomfortable with the process, it is recommended to seek professional assistance.