![]() For example, if you are driving at a low speed and your vehicle suddenly shifts into neutral for no reason, there could be something wrong with your TCM. If your vehicle shifts when you did not intend it to, or shifts into gears that you did not want it to, you may very well have problems with your transmission control module. If the check engine light is on, take your vehicle to your local mechanic so they can run a diagnostic scan. The check engine light indicates a problem with your vehicle, including transmission control module problems. What are some of the things that can go wrong with a TCM? Let’s discuss. What Are the Symptoms of a Bad Transmission Control Module? Here is a list of possible symptoms that could indicate that your transmission control module has gone bad. If your car is having problems, the TCM could be involved. The best way to check and test a transmission control module is to observe how your vehicle is driving. The TCM is typically found on or near the transmission itself. However, you can generally expect it to be located somewhere in, on, or close to the engine because it needs to be connected to the vehicle’s computer via its data port. The location of the transmission control module will also vary from vehicle to vehicle. Generally, they are flat, square, metallic, or plastic and have ridged edges. Here’s an example of a transmission control module for a Mazda 3. Generally, they look like small metallic or plastic external hard drives, with a data port on one side. Transmission control modules vary in size and shape depending on the make and model of the vehicle you drive. What Does A Transmission Control Module Look Like? Based on data it receives from the rest of the vehicle, the TCM tells your transmission when to upshift or downshift. The transmission control module determines the best time for your vehicle to change gears. What Does The Transmission Control Module Do? For a more detailed explanation of how TCMs work, check out this link. ![]() The TCM allows your vehicle to determine the best time to shift to maximize fuel economy, shift quality, and reduce wear and tear. How Much Does It Cost to Replace a Transmission Control Module?.How to Replace a Bad Transmission Control Module.What Causes a Transmission Control Module to Fail?.What Are the Symptoms of a Bad Transmission Control Module?.
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