Signs of a Bad Transmission Control Module

Your car is a well-oiled machine. You step on the gas, the engine roars, the transmission transfers the engine’s power to your wheels, and you start moving forward. Every component of your vehicle has a purpose, so it’s pretty noticeable when one of those components starts acting up.

Here at Group 1 Mazda Denton, we can help you figure out what’s going on. With this guide, you’ll be able to notice signs of a bad transmission control module. That way, you can ensure your drives around Denton, Carrollton, and Flower Mound, TX, stay as safe as possible.


What Is a Transmission Control Module?

Before we get into the signs of a bad transmission control module (TCM), let’s go over what exactly the transmission control module is. The transmission control module is responsible for calculating the right time and place to shift gears.

A transmission control module is a vital piece of your vehicle. It works alongside your transmission and engine to change gears as you drive. In addition to making your drives smoother, it also helps improve the overall efficiency of your vehicle. It also will send signals to your vehicle’s main computer if any issues are detected.


Signs of a Bad Transmission Control Module

Signs of a Bad Transmission Control ModuleBecause your transmission control module is such a vital component of your vehicle, you want to make sure it’s in perfect condition. Problems with the TCM are relatively easy to spot. Here are a few common ones:

  • Check Engine Light: The transmission control unit works with the engine, so it may cause the check engine light to come on when it’s faulty.
  • Unpredictable Shifting: A bad TCM can cause incorrect or unintended shifting. For example, it might downshift or upshift when it shouldn’t.
  • Failure to Change Gears: A bad TCM could also fail to change gears at all. For instance, if it stays in neutral or park, this is a sign of a faulty TCM.
  • Poor Fuel Economy: Your transmission is meant to optimize your fuel efficiency, so if you notice that your fuel economy is worse, it may be due to your TCM.

If you notice that your transmission is not downshifting when you’re at a stop or upshifting when you accelerate, your transmission control module may be failing.


How We Can Help

How We Can HelpAs you can see, there are many ways to tell when your transmission control module is bad. Because the transmission is such an important part of your vehicle, it’s vital to get service as soon as possible. That way, you can ensure your car is driving correctly and keeps you safe.

Our factory-trained technicians can diagnose and fix any issues you might have with your vehicle. If your transmission control module is faulty, we can figure out why and replace it. When we do replace parts, we use OEM, or original equipment manufacturer parts. That means that the replacement TCM we outfit your vehicle with will fit perfectly.


Schedule Service Today

If you notice any signs of a bad transmission control module while you’re driving aroudn Denton, Carrollton, or Flower Mound, Texas, schedule your service appointment with us today.

You can call or schedule your appointment online. Here at Group 1 Mazda Denton, we’re dedicated to making sure your vehicle is running like new.


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5000 S Interstate 35, Denton, TX, 76210
Group 1 Mazda Denton 33.163182, -97.077162.