Subaru Transmission Control Module Reset

To reset the Subaru Transmission Control Module, locate the fuse box and remove the negative battery cable for 15 minutes. If your Subaru is experiencing transmission-related problems, such as harsh shifting, erratic shifting, or being stuck in gear, resetting the Transmission Control Module can potentially resolve these issues.

The Transmission Control Module is responsible for controlling and regulating the automatic transmission in your Subaru vehicle. By resetting it, you can clear any error codes or accumulated data that may be causing the transmission problems. This simple procedure can be done at home without the need for professional assistance or expensive tools.

We will guide you through the process of resetting the Subaru Transmission Control Module and provide some additional tips to ensure a successful reset.

Subaru Transmission Control Module Reset: Why And How

Resetting the transmission control module (TCM) of your Subaru is an essential task to ensure optimal performance. The TCM plays a crucial role in controlling the transmission system, including gear shifts and clutch engagement. By resetting the TCM, you can resolve issues related to rough shifting, delayed engagements, or improper gear selection.

Resetting the TCM also allows it to recalibrate itself, adapting to your driving style and preferences. It is important to note that a TCM reset should be performed after any transmission repairs or software updates to ensure the module is functioning correctly.

To reset the TCM, you can either use a professional diagnostic tool or a manual procedure provided by Subaru. Following the correct procedure is vital to avoid any potential damage to the transmission system. Keep in mind that if the TCM is not reset when necessary, it could lead to further transmission problems in the long run.

Proper maintenance and regular TCM resets are crucial for a smooth and efficient driving experience in your Subaru.

Symptoms Of A Malfunctioning Transmission Control Module

A malfunctioning Transmission Control Module (TCM) in your Subaru can cause a range of transmission issues. One symptom is rough gear shifting, where the gears may feel jumpy or not engage smoothly. Another sign is delayed or erratic shifting, where the transmission may take longer than usual to shift gears or may shift at unexpected times.

Transmission slipping can also occur, which is when the engine revs but the vehicle doesn’t accelerate as expected. Additionally, you may notice dashboard warning lights illuminating, indicating a problem with the TCM or transmission system. If you experience any of these symptoms, it is important to have your TCM checked and, if necessary, reset by a trained technician to restore proper transmission function.

Understanding The Subaru Transmission Control Module

The Subaru Transmission Control Module (TCM) plays a vital role in the functioning of the transmission system. It acts as the brain of the system, regulating various components to ensure smooth gear shifts and optimal performance. The TCM consists of several important components, including sensors, solenoids, and the valve body.

Sensors provide crucial input to the TCM, relaying information about speed, throttle position, and other factors that influence gear selection. Solenoids, on the other hand, control the flow of hydraulic fluid, enabling gear changes. The valve body, meanwhile, houses various valves that direct fluid to different parts of the transmission, facilitating gear shifts.

These components work together seamlessly, allowing the TCM to monitor and adjust the transmission’s performance in real-time. Understanding the role of the Subaru TCM is essential for troubleshooting and performing a transmission control module reset when necessary to maintain optimal vehicle performance.

Subaru Transmission Control Module Reset


When And Why Resetting The Subaru Tcm Is Necessary

Resetting the Subaru Transmission Control Module (TCM) is necessary in certain situations. The most common reasons for resetting the TCM include battery replacement, software update, and faulty sensor or solenoid replacement. When the battery is replaced, the TCM may lose its previous settings and needs to be reset for proper functionality.

Similarly, a software update may require a TCM reset to ensure compatibility and optimal performance. Additionally, if a sensor or solenoid is faulty and replaced, resetting the TCM can help synchronize the new component with the vehicle’s transmission system. Resetting the TCM offers several benefits, such as improved shift quality, increased fuel efficiency, and enhanced overall performance.

It is recommended to consult the vehicle’s manual or seek professional assistance to properly reset the Subaru TCM when necessary. Stay informed about the specific requirements for your vehicle to ensure smooth and reliable transmission operation.

Step-By-Step Guide: How To Reset The Subaru Tcm

Resetting the Subaru Transmission Control Module (TCM) is a straightforward process that can be done using an OBD-II scanner or software. Once you have identified the location of the TCM, gather the necessary tools for the reset. Before proceeding, it is important to take safety precautions to prevent any damage to your vehicle or yourself.

Connect the OBD-II scanner or software to the TCM and follow the step-by-step instructions for resetting. After the reset is complete, it is recommended to perform a test drive to ensure that the TCM has been successfully reset. By following these simple steps, you can easily reset the Subaru TCM and resolve any transmission-related issues.

Alternative Methods For Subaru Tcm Reset

Resetting the transmission control module (TCM) in your Subaru can be done through alternative methods. One approach is by disconnecting the battery. This involves removing both the positive and negative terminals, waiting for a few minutes, and then reconnecting them.

Another method is performing a manual reset. To do this, you need to locate the TCM, unplug it from its connectors, leave it disconnected for a while, and then reconnect it. Both of these methods can help reset the TCM in your Subaru and potentially resolve any related issues you may be experiencing.

It’s important to follow the proper steps and guidelines to ensure a successful reset without causing any damage to your vehicle.

Precautions And Important Considerations

When resetting the transmission control module (TCM) on your Subaru, it is crucial to take certain precautions and consider important factors. Seeking professional assistance is highly recommended to ensure a smooth and successful reset process. Professionals have the expertise and knowledge to handle the TCM reset accurately.

It is also essential to ensure software compatibility before initiating the reset. This ensures that the TCM and other components of your Subaru’s transmission system are compatible with the reset procedure. Additionally, backing up TCM data, if applicable, is crucial to prevent potential data loss or complications during the reset process.

Following these precautions and considerations will help you reset your Subaru’s TCM with confidence.

Frequently Asked Questions (Faqs)

Resetting the Subaru Transmission Control Module (TCM) is a common practice for resolving transmission issues. However, the frequency of TCM resets depends on the specific problem encountered. In some cases, a single reset may fix the issue, while in others, multiple resets may be required.

It is important to note that resetting the TCM will not address all transmission issues. If the problem persists after a reset, it is recommended to consult a professional. While it is possible to perform the reset yourself, it is advisable to seek expert assistance to ensure the procedure is carried out correctly.

Properly resetting the TCM can help restore the smooth operation of your Subaru’s transmission.

Frequently Asked Questions Of Subaru Transmission Control Module Reset

Is There A Way To Reset A Transmission Control Module?

Yes, a transmission control module can be reset using a diagnostic scan tool.

What Are The Steps To Resetting Transmission Control Module?

To reset your transmission control module, follow these steps: 1. Turn off your vehicle’s engine. 2. Disconnect the negative battery cable. 3. Leave it disconnected for at least 15 minutes. 4. Reconnect the negative battery cable and start your vehicle. Note: This process may vary for different car models.

Consult your vehicle’s manual for specific instructions.

What Are The Symptoms Of A Bad Tcm?

Symptoms of a bad TCM include rough shifting, delayed engagement, and total transmission failure.

How Much Does It Cost To Reprogram A Transmission Control Module?

The cost to reprogram a transmission control module varies depending on the vehicle model and the location.


Resetting the Transmission Control Module (TCM) in your Subaru can be a simple and effective way to resolve transmission-related issues. By following the proper steps outlined in this blog post, you can ensure a successful reset and potentially save yourself the hassle and expense of a trip to the mechanic.

From disconnecting the battery to relearning the transmission adaptives, each step plays a critical role in resetting the TCM and restoring optimal performance to your Subaru. Remember to consult your vehicle’s manual for detailed instructions and always exercise caution when working with electrical components.

By taking the time to properly reset your Subaru’s TCM, you can ensure a smoother and more enjoyable driving experience for years to come.


  • Luke Jonson

    For over a decade, I've immersed myself in the automotive world, with a keen focus on Subaru transmissions. My hands-on experience, having tackled countless Subaru systems, has made me a trusted authority in the field. Recognized for my significant contributions, I've always aimed to empower fellow car enthusiasts and professionals. Through every article, I ensure authenticity, relevance, and trustworthiness, striving to share my profound knowledge. Dive into my insights, and drive with the confidence that comes from expert guidance.

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