Every so often you notice it: The transmission shifts a little late, or maybe it seems to miss a gear entirely. Then it’s okay again… for a little while. Worst of all, there’s no rhyme or reason behind the condition. One minute it’s fine, the next it’s not. So you pop the hood to check the transmission fluid level. Then you notice it: A big mountain of corrosion on the battery terminals. You’ll have to take care of that, but it can’t have anything to do with the transmission, right?
Prevention is better than cure. You've probably heard that said plenty of times. The phrase is most often used to talk about health and medicine, but it is just as valid to apply it to vehicles. It's great if your problem can be sorted without much trouble, but even better not to have a problem in the first place. This is especially true when it comes to your vehicle's transmission, as this can be one of the more specialized parts to repair. Not all transmission problems require an extensive overhaul, but they will all cause at least some trouble and inconvenience. Avoiding transmission problems is clearly preferable to even the problems that are quickest and cheapest repair. This is why it is important to ensure you take good care of your transmission. This will help prevent problems and keep it working smoothly. Ideally, it will mean that it doesn't develop any faults at all. Even if it does eventually go wrong, however, it is entirely possible that good care will mean the fault is less serious and easier to repair than it would have been otherwise.
Today’s Automatic Transmissions use a variety of sensors on the engine and throughout the car, along with a computer system that control its functions. Most computer-controlled transmissions use a TCM (Transmission Control Module) however; some systems use a single computer for both the engine and transmission control. These are commonly referred to as an ECM (electronic Control Module).