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).
Your transmission suddenly isn’t shifting right. So what’s wrong with it? Do you need your transmission rebuilt? Good question. Unfortunately, the answer is: No one knows. At least, not yet. To find out what’s causing your transmission problem, a technician is going to have to perform a series of tests. Basically, these tests are designed to answer the simple question: “Is it inside or outside?” That is, is the problem inside the transmission, or in one of the many control systems that operates the transmission?