How To Reset Allison Transmission

How to Reset Allison Transmission | Long Blog Post

Allison Transmission is a popular and widely used transmission system in various vehicles, including buses, trucks, and RVs. It is known for its durability and performance. However, like any other mechanical system, it may encounter issues from time to time. One of the common troubleshooting techniques is resetting the transmission. In this article, we will guide you through the steps to reset your Allison Transmission effectively.

Step 1: Stop the Vehicle

The first step in resetting the Allison Transmission is to bring the vehicle to a complete stop. Safety should be your top priority when working on any mechanical system. Make sure the vehicle is parked on a level surface and engage the parking brake.

Step 2: Turn Off the Engine

Once the vehicle is stopped, turn off the engine completely. This will ensure that the transmission is not engaged and allows for a safe reset process.

Step 3: Locate the Battery

Locate the vehicle’s battery. In most vehicles, the battery can be found under the hood. If you are unsure about its location, consult the vehicle’s manual or seek assistance from a professional. Ensuring a steady power supply is crucial for a successful transmission reset.

Step 4: Disconnect the Negative Terminal

Using a wrench or battery tool, disconnect the negative terminal of the battery. This step will prevent any electrical current from flowing through the system during the reset process. It is essential to disconnect the negative terminal specifically to avoid any potential hazards.

Step 5: Wait for 30 Minutes

After disconnecting the negative terminal, wait for at least 30 minutes. This time allows the electronic modules in the vehicle to drain any remaining power and reset. This step ensures a complete system reset for the transmission.

Step 6: Reconnect the Negative Terminal

Once the waiting time is over, reconnect the negative terminal of the battery. Ensure that the terminal is securely attached to prevent any loose connections that could affect the resetting process.

Step 7: Start the Engine

Turn on the engine and allow it to idle for a few minutes. This step is necessary to reset the transmission control module and initiate the learning process for the transmission system. It is recommended to keep the vehicle stationary during this period.

Step 8: Take a Test Drive

After completing the previous steps, take the vehicle for a test drive. Monitor the transmission’s behavior and check if the issues you were facing prior to the reset have been resolved. During the test drive, pay attention to shift points, smoothness of gear changes, and any abnormal noises or vibrations.

Step 9: Monitor and Follow-Up

Once you have reset the Allison Transmission and taken a test drive, it is essential to monitor its performance in the following days. Observe if any of the previous issues reoccur. If the problems persist or new challenges arise, it is advised to consult a professional mechanic or contact the manufacturer for further assistance.

Frequently Asked Questions For How To Reset Allison Transmission

How Do I Reset My Allison Transmission?

To reset your Allison transmission, you can start by turning off the engine and disconnecting the battery. Leave it disconnected for at least 30 minutes to ensure a full reset.

Why Is It Important To Reset My Allison Transmission?

Resetting your Allison transmission can help resolve issues like erratic shifting or a malfunctioning control module. It allows the system to reboot and start fresh, potentially improving performance.

What Are The Common Symptoms That Indicate The Need To Reset My Allison Transmission?

Common symptoms that might indicate the need to reset your Allison transmission include rough shifting, slipping gears, delayed engagement, or the transmission failing to shift into certain gears.

Can I Reset My Allison Transmission Without Disconnecting The Battery?

While disconnecting the battery is the most effective way to reset an Allison transmission, you can also try other methods such as using a diagnostic tool to clear any error codes or resetting the transmission control module.

Is It Necessary To Reset My Allison Transmission After Making Repairs Or Modifications?

Yes, it is recommended to reset your Allison transmission after making any repairs or modifications. This ensures that the system recognizes the changes and operates optimally.


Resetting Allison Transmission can be a helpful troubleshooting step to resolve certain issues you may encounter while using your vehicle. By following the steps outlined in this guide, you can safely and effectively reset the transmission. Remember to prioritize safety and reach out to professionals if needed. Enjoy a smooth driving experience with your reset Allison Transmission!

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