If you hear noise coming from your vehicle's transmission, it may indicate that transmission parts are hitting together abnormally. Normally-functioning transmissions are virtually free of noise, when clean transmission fluid is lubricating the moving parts.

Tracking down the source of the noise can be complicated. Unlike many other repair facilities, AAMCO Center technicians are experts in all systems in your car, truck, and SUV and perform both external transmission diagnostics and a complete car check. So they know the difference between a simple exhaust problem causing noises-and a potentially significant transmission problem.

• There is buzzing or any other noise from the transmission
• If your vehicle is a four-wheel drive, there is a clicking noise in the transmission while it is in 4-wheel drive mode
• There is a clunking from under the vehicle when you change gears

• An internal transmission repair may be necessary if parts within the transmission are worn or damaged
• The transmission fluid is low, dirty, or the incorrect type
• Electrical components or external controls for the transmission may simply need adjustment or replacement.

Take your car, truck or SUV to the experts at AAMCO for an External Diagnostic Service. Our certified technicians will help get to the bottom of your problems and get your vehicle back on the road as soon as possible.

• The fluid transfers power from the engine to the transmission, and provides the necessary pressure to operate the transmission.
• Transmission fluid also cools and lubricates the transmission.

As the amount of transmission fluid goes down, the ability to operate and keep the transmission cool is reduced. Overheating quickly causes damage to a transmission that may ultimately result in the need for a costly repair.

Leaks can occur from several different areas external to the transmission, or they may be internal to the transmission. The repairs required could be relatively minor, or the signs could point to a major problem. It takes an expert to tell.

Regardless of what the source of the leak is, it requires immediate attention. The longer the leaks continue, the more damage that may result. Trust the expert transmission technicians at AAMCO to get you and your vehicle back on the road as soon as possible.

If your vehicle will not move, or you are concerned about driving it any further, call your nearest AAMCO Center. If your vehicle needs to be towed, your AAMCO center can make the arrangements.

Once your vehicle is towed to the nearest AAMCO Center, our expert technicians will do a thorough check of the external controls/components to determine why the vehicle is not moving. Our technicians check the transmission fluid level and condition. We'll check the level and condition of your transfer case and differential fluid (where applicable). We'll check under the hood and under the car to get up close to all of the possible causes external to the transmission of the vehicle's problem. AAMCO's External Diagnostic Service is the gold standard in the transmission business.

Our technicians are experts in transmissions and complete car care, so we'll put your car through AAMCO's comprehensive 36-point ProtectCheck. No matter what your car, truck or SUV's problem, the experts at AAMCO will get to the bottom of it. And get you and your vehicle back on the road as soon as possible.

If you have ever driven a vehicle or behind a vehicle with a "rotten egg" smell, it can be due to a faulty oxygen sensor. The oxygen sensor is in the exhaust system, and in part provides information to the on-board computer to help calculate fuel delivery to the engine.

The CHECK ENGINE LIGHT on your instrument panel can light up for a wide variety of reasons, often related to emissions, the engine, or the transmission. We urge you not to ignore the CHECK ENGINE LIGHT when it illuminates, but to have your vehicle checked out. According to a national survey, more than one in ten drivers admit they drive with the CHECK ENGINE LIGHT on-approximately 20 million vehicles per week.

Some vehicles also have an oxygen sensor light that appears when the sensor needs replacement, or it can also cause the CHECK ENGINE LIGHT (in some models, the SERVICE ENGINE SOON light) to come on. If the light remains lit, do not ignore it. There could be a simple solution, or it could be a warning sign of a much more severe condition. AAMCO centers can diagnose whatever the problem may be. There could be a simple solution, or it could be a warning sign of a much more severe condition. AAMCO Centers can diagnose whatever the problem may be.