Common auto transmission problems include lack of response, leaking fluid and grinding noises. It is important to have auto transmission problems fixed by a certified mechanic as soon as they occur to avoid further damage.
A car that hesitates before going into gear is a common transmission problem that usually indicates a faulty clutch. The car should go into the proper gear once it is engaged. The clutch needs to be changed to fix the problem, but there could be more severe problems that can only be diagnosed by a qualified mechanic.
Leaking ATF is another common problem with auto transmissions, which needs to be resolved as soon as possible. If the fluid on the ground is bright red and clear, the problem could be a hole that needs to be fixed. Fluid that has a burned smell or is dark in color indicates more severe problems, and that the fluid needs to be changed.
Lastly, shaking, jerking or grinding noises is a common problem especially with manual transmissions. This usually indicates that the clutch is faulty, and it needs to be replaced or adjusted. Other possible problems include worn out or damaged gear synchronizes. The car needs to be taken to a qualified mechanic in all of these cases to diagnose the specific problem and fix it.