You should check the transmission fluid level if your car starts shaking or emitting grinding sounds when you accelerate. The scan tool will display a code corresponding to the vehicle’s problem area. To determine if it’s a transmission failure, you can purchase a diagnostic scan tool that you plug into your car underneath the driver's side of the instrument panel. However, your check engine light can come on for many reasons. Newer cars have sensors throughout the engine that detect irregularities, including vibrations in the transmission. Your car's check engine light can be a great early indicator that something is wrong with your transmission. Your check engine light should come on to indicate you have some type of problem, though it won't tell you it's a transmission issue. ![]() Check manual transmission fluid at the transmission case through the fill plug. If you have a manual transmission, checking the fluid levels may be more complicated than lifting the hood and reading a dipstick. Unlike your car's motor oil, the transmission shouldn’t consume or burn up any fluid during use, so if you notice you're running low on fluid, it's likely leaking out somewhere. If it has either of those qualities, you'll need to take it to a mechanic and have it replaced. When you check your automatic transmission fluid, make sure it's not a dark color and doesn't have a burnt smell. ![]() ![]() Automatic transmission fluid is typically bright red, translucent and a little sweet-smelling when everything's working correctly. Automatic transmission fluid is vital to your car's shifting capabilities, so a little fluid on your driveway can quickly become a major problem. Leaking transmission fluid is one of the easiest ways to identify that your transmission needs attention. That's a sure sign of transmission troubles. Gears or Transmission SlippingĮven if you don't drive a manual transmission, your gears can still slip. In this case, common culprits are a worn reverse idler gear or worn bearings, possibly coupled with worn gear teeth. Lots of noises from the transmission while it's in neutral could signal something more serious, like mechanical wear that will need parts replacement. Your constant velocity joints (CV joints) or differential could be the culprit. But a clunking sound coming from underneath your vehicle may not always point to a transmission problem. If you shift gears and hear a clunking sound, you must have it checked out by a professional. ![]() The sounds will usually come across as more abrupt and mechanical-sounding with manual transmissions. Still, if you have an automatic transmission, a whining, humming or even a slight buzzing sound may indicate transmission issues. Transmission NoisesĮvery car is different, so the sounds they produce can vary greatly. Remember that transmission fluid isn’t the only thing that can burn in a car if your transmission fluid is fine, you may have a blown fuse, worn-out brake pads or burning oil. Your transmission fluid might start to burn if it’s too low, potentially indicating a leak or dirty fluid that needs changing. Transmission fluid lubricates the transmission's many moving parts and prevents the unit from burning itself up. A burning, sweet smell may indicate your transmission is overheating. If you get a whiff of burning transmission fluid, be advised it is not the sweet smell of success. It could also indicate a problem with the shift cables or clutch linkage, or, in the worst case, you may need to rebuild your transmission. Common causes include low transmission fluid or wrong viscosity (thickness) of the transmission fluid, which are relatively easy fixes. It may happen when you're trying to get into first gear from a stop or at any point when shifting gears.
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