How To Reset Mitsubishi Transmission Control Module?

How to reset Mitsubishi transmission control module (TCM) is a vital thing to understand since it is a critical component of a Mitsubishi vehicle’s automatic gearbox system. It regulates gear changing, which has an impact on your car’s performance and fuel economy.

Reset Mitsubishi Transmission

A defective TCM can cause poor fuel economy, a broken gearbox, and a check engine light to illuminate. This comprehensive guide will walk you through the detailed process of resetting a Mitsubishi transmission control module to restore its performance.

How Can You Reset a Mitsubishi Transmission Control Module?

To reset a Mitsubishi transmission control module, you have to turn the car key in the ignition, press the accelerator pedal, turn off the key and release the pedal, wait for 2-5 minutes, start the engine and drive, reset the battery, and finally drive the car slowly.

1. Turn the Key in the Ignition

To ensure that the car’s electrical system is active and ready for the reset procedure, insert the key inside the chamber of ignition. After that, turn this over two times until the dashboard illuminates. The dashboard lights should illuminate, indicating that the vehicle’s power is turned on and the transmission control module (TCM) is ready to be reset.

Remember that the key should be flipped over twice fast. If the key is turned too slowly, it may not register as two independent turns, preventing the TCM from being reset. Also, the key should not be kept in the “on” position for a lengthy amount of time because this might deplete the battery.

When attempting to reset the TCM, make sure the car is in park or neutral. Trying to reset the TCM while the car is in drive may cause the transmission or other automotive components to be damaged. The automobile should be in the “on” position after the key has been turned twice, but the engine should not yet be started.

2. Press the Accelerator Pedal

It is vital to press the accelerator pedal to verify that the TCM is correctly reset and can communicate efficiently with the engine control unit (ECU). Before beginning this stage, make sure the car’s engine is still switched off and the key is in the “on” position.

Pressing Accelerator Pedal

Push down on the accelerator pedal until it almost touches the floor while your foot is off the brake pedal. It’s critical to push the pedal deeper than the kick-down position, and a click will signal that you’ve done so.

After the pedal is fully depressed, it should be maintained in place for 10 to 15 seconds. The TCM will be reset during this period, and the car’s electronic control systems will be re-initialized. To ensure that the TCM is correctly reset, keep the pedal depressed for the duration of this step.

It’s worth mentioning that hitting the accelerator pedal is not a universal reset procedure and should only be utilized on Mitsubishi automobiles. Trying to utilize this procedure on other automobile models may result in harm to the electrical control systems of the vehicle and should be avoided.

3. Turn off the Key and Release the Pedal

Turn off the ignition and let off the accelerator pedal after keeping it down for 10 to 15 seconds.

Releasing Pedal on Mitsubishi

For the TCM to reset after the previous step, this step is crucial. The TCM will have to relearn where the accelerator pedal should be concerning the idle speed control as soon as the accelerator pedal is withdrawn.

To maintain safety, you must keep the car in park or neutral when you switch off the key, depending on the model of your car. Make sure your foot is completely off the accelerator pedal before you let go. The reset procedure could be hampered if the key is turned to the accessory position before releasing the pedal.

4. Wait for 2-5 Minutes

It is critical to wait 2 to 5 minutes after turning off the ignition and releasing the accelerator pedal before moving to the next procedure. This waiting period is critical for the reset procedure to take place. The transmission control module (TCM) will shut down and reset itself during this period, which may take a few minutes.

During this waiting period, it is critical not to touch any of the vehicle’s electrical systems, since this may disturb the reset process. It is also good to switch off any devices that may be using battery power, such as the radio or air conditioning. The TCM will reset itself and relearn the vehicle’s driving patterns during this period.

The transmission control module (TCM) connects with the engine control module (ECM) to identify the best shifting patterns for the vehicle depending on the driver’s habits, road conditions, and other considerations. The TCM will have ample time to reset itself and provide a clean slate for learning these patterns if you wait a few minutes.

Remember that the time necessary to reset the TCM varies based on the vehicle and the state of the TCM. It is suggested for you to wait at least 2 minutes or so and up to 5 minutes before heading over to the next step. When the waiting period is through, the TCM will be able to interact with your vehicle’s ECM and restart regular functioning.

5. Start the Engine and Drive

After the waiting period is finished, you can start your car and drive away. The TCM should now interact successfully with the ECU and other electrical systems in your car after being reset. During your initial few minutes of driving, it is critical to take things slowly and gently. Begin by idling your car for a few seconds before shifting into gear.

Driving Mitsubishi Car

To avoid any sudden movement, keep your foot on the brake pedal during this operation. When you’re ready to start driving, it’s recommended to go slowly and steadily. For the first few minutes, gently accelerate and maintain a constant pace of no more than 15 mph.

At this period, avoid abrupt acceleration or harsh braking to allow the TCM and ECU to communicate and work properly. After you’re satisfied with your vehicle’s performance, gently raise your speed to 50 mph.

Likewise, make careful to slowly accelerate and prevent abrupt braking or acceleration. This will assist the TCM and ECU in recalibration and effective communication. As you continue to drive your car, keep a close eye on its performance.

If you encounter any problems such as harsh shifting or low fuel efficiency, you may need to repeat the reset procedure. This might mean that there are issues or problems with your vehicle’s transmission or other components that need to be fixed.

6. Reset the Battery

Resetting the batteries to delete all stored data and allow for a fresh start is a critical step, especially if the preceding methods failed to reset the TCM. The first step in the battery reset TCM process is to disconnect both the positive and negative connections.

Battery Reset TCM Process

The last step is to wait for all of the electrical systems to completely drain, which can take many hours. This step guarantees that all capacitors in the electrical system have been completely depleted and that the TCM may be correctly reset.

The next action step is to reconnect the battery terminals by starting with the positive terminal and moving on to the negative terminal in the order they were disconnected. To prevent any loose connections, it is crucial to make sure that the terminals are tightened thoroughly.

The next action step is to start the Mitsubishi engine and let it idle for a few minutes after the battery has been reset. Next, switch the transmission lever three times back and forth between the park and the lowest gear. The calibration of the transmission for the proper operation depends on this stage.

7. Drive the Car Slowly

Now that you’ve reset the battery, go for a gentle drive in your automobile. The purpose of this step is to assist the gearbox in learning and adapting to your driving style. Driving softly, with no abrupt acceleration or braking, can help the transmission work more efficiently and increase fuel efficiency.

Begin by shifting the automatic gearbox three times in a row between the park and the lowest gear while maintaining your foot on the brake. This step aids in the calibration and adjustment of the transmission to the new parameters.

Next, drive slowly, no faster than 15 miles per hour. Light acceleration is essential here, so be cautious with the gas pedal. The transmission must adjust to the new settings, which might be hampered by aggressive driving.

Decelerate to a complete stop without applying the brakes and allow the engine idle for a few minutes. This gives the gearbox time to acclimate to the new driving style. Now, turn off the engine and let the car alone for a few seconds.

This phase allows the transmission to rest and cool down. Put your foot down on the brake again and shift the transmission three times between the park and the lowest gear. This procedure assists the transmission in relearning the new parameters.


The procedures mentioned in this Mitsubishi transmission control module guide should help you reset your TCM, but if they don’t, you may need to prepare yourself for a replacement cost.

To sum it up, the main ideas we’ve discussed are:

  • Transmission problems can be solved by resetting the bad transmission control module.
  • The first steps are to turn the key in the ignition, press the accelerator pedal, then switch the key off.
  • The method concludes with a 2-5 minute wait, starting the engine and driving, and resetting the battery.
  • To guarantee accurate TCM resetting, carefully follow each procedure.
  • Drive gently after resetting the car to allow the TCM to acclimatize to the new settings.

In any case, frequent maintenance and monitoring of your vehicle’s transmission fluid and control modules can avoid future problems and save you cash in the long term.

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