Where is the Transmission Control Module Located

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The transmission control module (TCM) is responsible for controlling the transmission in your vehicle and is an important part of your car’s engine management system. It is typically located near the transmission, either on the side of the engine or under the dash. If you are having problems with your transmission, it is important to know where the TCM is located so that you can have it checked by a mechanic.

In this article, we will show you how to find the transmission control module in your car along with more related information about this critical engine component.

What Is the Function of the Transmission Control Module?

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The transmission control module (TCM) is a vital component of a vehicle’s transmission system. It monitors and controls the operation of the transmission and ensures that it is functioning properly. The TCM also stores data related to the transmission, such as diagnostic information and operating conditions.

When the TCM detects an issue with the transmission, it will often trigger a warning light on the dash to alert the driver. In some cases, the TCM may even prevent the transmission from shifting into certain gears in order to protect it from further damage.

Where Is the Transmission Control Module Located? 

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The specific location of the TCM can vary depending on the make and model of the vehicle. In many cases, it is located near or attached to the transmission itself. It may also be located in the engine bay, under the dash, or in the trunk.

If you are having trouble finding the TCM on your own, consult your vehicle’s owner’s manual or a professional mechanic. Once you have located the TCM, it is important to avoid damaging it when working on or around the transmission.

7 Symptoms of a Bad Transmission Control Module 

You may experience one or more of the following symptoms if your transmission control module is failing:

1. Check Engine Light

One of the first and most common signs of a failing transmission control module is the Check Engine Light. The check engine light will come on if there are any issues with your car’s engine or transmission. In order to find out what is causing the check engine light to come on, you will need to have your car’s computer scanned for trouble codes.

2. Unpredictable Shifting

An easier way to notice the TCM going bad is if the car starts to shift erratically. The transmission may slip in and out of gears or shift too hard. These issues can be caused by a variety of things, but a failing TCM is one potential cause.

3. Problems Shifting Into Higher Gears

You may notice that your car has problems shifting into higher gears when increasing speed. This is because the TCM is not sending the correct signal to the transmission telling it when to shift. This might be more prominent when driving on the highway.

4. Problems Downshifting

Similar to shifting into higher gears, you may have issues downshifting as well. This can cause your car to jerk or lurch when slowing down or coming to a stop.

5. Delayed Shifting

Another symptom of a bad transmission control module is delayed shifting. This means that there is a lag between the time you put your foot on the gas pedal and the time the car actually starts to move. This can be dangerous as it can cause you to get rear-ended.

6. Stuck in the Same Gear

Despite moving your shifter to the appropriate position, your car may get stuck in the same gear. This is another symptom of a bad transmission control module.

7. Poor Fuel Economy

A little more difficult to notice, but a failing transmission control module can also cause poor fuel economy. This is because the transmission may not be shifting into the correct gear, which causes the engine to work harder and use more fuel.

Transmission Control Module Replacement Cost

This very much depends on the make and model of the vehicle and the labor rates of your location. Replacing just the TCM can cost around $500 to $700. If you are also getting your transmission rebuilt or replaced, then the total cost will be much higher. It is always best to consult with a professional mechanic to get an accurate estimate for your specific vehicle.

Transmission Control Module Repair Cost

Once again, the cost to repair a failing transmission control module will depend on the make and model of the vehicle as well as labor rates in your area. In some cases, you may be able to have the TCM reflashed or reprogrammed. This is often a cheaper option than outright replacement. If the TCM does need to be replaced, then the cost will be similar to the replacement cost.

How to Prevent Transmission Control Module Problems

There are a few things you can do to prevent transmission control module problems:

  • Check and change your transmission fluid regularly. This will help keep your transmission clean and cool, which extends its life.
  • Avoid excessive idling. Idling puts unnecessary stress on the transmission and can cause it to overheat.
  • Don’t tow too much weight. Towing too much weight can damage the transmission and cause the transmission control module to fail.
  • Take your car to a mechanic regularly for checkups and maintenance. This will help identify any potential issues before they become big problems.

Also Read: How much does it Cost to Replace a Transmission Mount


The transmission control module is a vital part of your car’s transmission. It controls the shifting of gears and helps to keep the engine running smoothly. If the TCM fails, it can cause a variety of problems with your car’s transmission. Replacing or repairing the TCM can be expensive, so it is best to take preventive measures to avoid transmission control module problems. 

Checking and changing your transmission fluid regularly, avoiding excessive idling, and not towing too much weight are all good ways to prevent TCM issues. Taking your car in for regular checkups is also a good idea. These simple measures can help extend the life of your car’s transmission and save you money in the long run.

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