Fixing P0702: Transmission Control System Range/Performance

If you’ve been experiencing issues with your car’s transmission and have come across the diagnostic trouble code P0702, it’s important to address it promptly.

P0702 indicates a problem with the Transmission Control System Range/Performance. In this article, we will provide you with a step-by-step guide on how to fix P0702 and get your transmission running smoothly again.

Understanding P0702: Transmission Control System Range/Performance:

P0702 is a trouble code that relates to the Transmission Control System Range/Performance. It indicates that there is an issue with the transmission range sensor or the circuit associated with it.

The transmission range sensor is responsible for providing information to the vehicle’s computer about the gear position, allowing the engine to adjust accordingly. When the transmission range sensor malfunctions, it can cause various problems with the transmission’s performance.

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Causes of P0702:

There are several potential causes for the P0702 trouble code. Some of the common culprits include:

  1. Faulty transmission range sensor: The sensor itself may be malfunctioning, providing incorrect readings or no readings at all.
  2. Wiring or connector issues: Damaged or loose wiring connections can disrupt the signal transmission between the transmission range sensor and the vehicle’s computer.
  3. Transmission control module (TCM) problems: A faulty TCM can also lead to the P0702 trouble code.

Symptoms of P0702:

When P0702 occurs, you may notice the following symptoms:

  1. Warning lights on the dashboard: The check engine light or the transmission warning light may illuminate to indicate a problem with the transmission.
  2. Difficulty shifting gears: You may experience difficulty shifting gears, including delays or harsh shifting.
  3. Slipping or jerking transmission: The transmission may slip or jerk during acceleration or while changing gears.

Diagnostic Process for P0702:

To diagnose and fix the P0702 trouble code, follow these steps:

  1. Checking the transmission fluid level and condition: Ensure that the transmission fluid level is correct and that it is clean and free of debris.
  2. Scanning for trouble codes: Use an OBD-II scanner to retrieve the trouble codes stored in the vehicle’s computer. This will help identify the specific problem.
  3. Inspecting the wiring and connectors: Thoroughly inspect the wiring and connectors associated with the transmission range sensor. Look for any signs of damage, corrosion, or loose connections.
  4. Testing the transmission range sensor: Use a multimeter to test the transmission range sensor’s voltage and resistance readings. Compare the results with the manufacturer’s specifications to determine if the sensor is faulty.

Step-by-Step Guide to Fixing P0702:

Follow these steps to fix P0702 and resolve the transmission control system range/performance issue:

Step 1: Gather the necessary tools and materials:

Before you begin, make sure you have the following tools and materials:

  • OBD-II scanner
  • Socket set
  • Screwdrivers
  • Multimeter
  • New transmission range sensor (consult your vehicle’s manual for the correct part)

Step 2: Locate the transmission range sensor:

Refer to your vehicle’s manual to find the exact location of the transmission range sensor. It is typically located on the transmission housing or the valve body.

Step 3: Disconnect the battery and ensure safety:

To prevent any electrical issues or accidental damage, disconnect the negative terminal of the battery. This will also reset the vehicle’s computer.

Step 4: Remove the old transmission range sensor:

Carefully disconnect the wiring harness and any other connectors attached to the sensor. Use the appropriate socket or screwdriver to remove the bolts securing the sensor in place.

Step 5: Install the new transmission range sensor:

Take the new transmission range sensor and align it correctly with the mounting position. Secure it in place using the bolts you removed earlier. Reconnect the wiring harness and any other connectors.

Step 6: Reconnect the battery and test the transmission:

Reconnect the negative terminal of the battery. Start the vehicle and test the transmission by shifting through the gears. Use the OBD-II scanner to clear any stored trouble codes and ensure that the P0702 code no longer appears.

Tips for Successful Repair:

Here are some tips to help you successfully repair the P0702 issue:

  • Always follow the manufacturer’s instructions and guidelines when working on your vehicle.
  • Use genuine replacement parts to ensure compatibility and reliability.
  • Take necessary safety precautions, such as wearing gloves and safety glasses, when working with tools and under the vehicle.
  • Double-check the installation of the new transmission range sensor to ensure it is properly aligned and secured.


Fixing the P0702 trouble code related to the Transmission Control System Range/Performance is essential to maintain the proper functionality of your vehicle’s transmission. By following the step-by-step guide provided in this article, you can address the issue and get your transmission back in good working condition. Remember to take safety precautions and consult your vehicle’s manual for specific instructions. If you’re unsure or uncomfortable with performing the repairs yourself, it’s always recommended to seek assistance from a qualified mechanic.


Can I continue driving my car with the P0702 trouble code?

  1. It is not recommended to continue driving your car with the P0702 trouble code, as it can lead to further damage to the transmission. It’s best to address the issue promptly.

How much does it cost to fix P0702?

  1. The cost of fixing P0702 can vary depending on the specific problem and the labor rates in your area. It’s advisable to consult with a mechanic or repair shop to get an accurate estimate.

Can I replace the transmission range sensor myself?

  1. Replacing the transmission range sensor can be a DIY job if you have the necessary tools and knowledge. However, if you’re unsure or uncomfortable with performing the repair, it’s best to seek professional assistance.