If your vehicle is stuck in first or neutral gear then your transmission may not shift at all causing your vehicle to not move, or even never shift up from the first gear leading to very slow speeds.Īll of these issues can lead to poor fuel economy as the optimal gears aren’t being selected leading to poor fuel efficiency and sometimes your check engine light can appear illuminated on your dash. This should cause the transmission controls to lower the gear you need until you come to a stop, but in some cases, you may stay in high gear and not be able to take off from the first gear after stopping. If this doesn’t happen at the right time due to a TCM fault then you may find your vehicle struggling to reach higher speeds with your RPM increasing instead of dropping as you upshift which means you may never reach the higher speed and full potential of the engine of your vehicle.Īlternatively, you may find an issue with downshifting when you lower your speed. With automatic vehicles, you will notice the transmission shifts into lower gears as you are gradually slowing, and higher gears when you increase speed on the freeway. Problems Shifting into Higher and Lower gears You must get this checked out as soon as possible, as it can be dangerous and cause accidents as you won’t have full control of your vehicle. Your TCM sends the signals needed to shift gears in your vehicle, so if you find your vehicle is shifting into the wrong gear or even into neutral without any warning this is a key sign of a fault. Let’s take a closer look at these issues and how to spot the signs of problems with your transmission control module. If you’re facing issues with your TCM then you may notice the issues spread to cause problems with your vehicle fuel economy and driving performance too.Ĭommon signs of a bad transmission control module include: Vehicles fitted with automatic transmissions will have a TCM component used to choose the ideal gear during motion. If you’re wondering how to reset the Mazda 3 transmission control module, it’s easy and only takes a few simple steps. When issues arise you may not notice anything more than some clunky gear changes, but you must act fast to fix these issues before they cause any serious hazards or dangerous conditions on the roads. They are responsible for reaching and maintaining your desired speed as well as getting the best fuel economy for your vehicle. The transmission control module is an extremely important part of all vehicles, including the Mazda 3.
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