What Causes a Transmission to go Bad?

As an important part of a vehicle's mechanical make-up, the transmission is responsible for allowing the vehicle to move, transferring the engine’s power to the wheels while regulating engine speed. The transmission is made up of a variety of interrelated parts and mechanisms. These parts can develop numerous problems that can cause the transmission to fail, resulting in a costly transmission repair.

So what causes a transmission to go bad? Here are some important issues to watch for:

1. Leaking transmission fluid. Look for signs of a transmission fluid leak (usually red in color) near the drain plug or seal between the transmission and the engine. Low automatic transmission fluid, one of the most common causes of a slipping transmission, reduces the hydraulic pressure necessary to properly shift. If there’s not enough fluid or it is starting to lose its effectiveness in lubricating and cooling, the transmission will perform poorly or stop working altogether.
2. Clogged transmission fluid filter. This filter helps keep the transmission fluid clean and of high quality. Unobstructed transmission fluid flow is necessary for the optimal operation and function of an automatic transmission, including the bands and gears. If the filter becomes clogged, it prevents the normal flow of fluid, preventing the fluid to lubricate and cool the transmission components.
3. Broken transmission bands. An automatic transmission uses a series of small rubberized transmission bands to synchronize gear operation. Transmission bands that are too tight can cause premature wear of the gears and cause the bands to break; bands that are too loose can cause gear slippage and a situation where a gear fails to engage properly
4. Broken transmission gears. In rare instances, transmission gears can break, which prevents normal shifting and disrupts the normal rotation of the transmission drive axle.
5. Faulty Torque Converter. The torque converter pumps and pressurizes transmission fluid throughout the entire transmission system. A faulty torque converter prevents the fluid from being pressurized and propelled throughout the transmission, thus allowing gears to slip out of place or operate erratically.
6. Ruptured Transmission Seals. Ruptured or faulty seals can allow the fluid to leak, resulting in serious damage.

Wondering what causes a transmission to go bad? Contact our ASE Certified technicians at Expert Car Care today for more information about transmission repair and to schedule an appointment. Our auto shop proudly serves residents in the community of West Allis, WI, and the surrounding area.