Like engine oil, transmission fluid is extremely important; without it, or the right amount of it, your transmission won’t work properly. Fluid issues are the cause of, or at least involved in, most of the problems you could have with a transmission, including those listed here. A few things to look for with fluid specifically:

For starters, your transmission fluid could simply be low. If your vehicle has a dipstick for transmission fluid (not all do), you can check the level yourself. Your engine should be warmed up and your car should be on a level surface and running to do this. If it’s low, top it off, but do not overfill it. If you don’t have a dipstick and your transmission has slipped or you’re experiencing other transmission-related issues (burning smell, grinding noises, hesitation to shift etc.), take your vehicle to a professional technician.

Like engine oil, your vehicle has recommendations for how often to replace the transmission fluid. With each mile you drive, your transmission fluid works to keep your transmission cool and clean, and it can start to get gunky or become debris-filled when you approach the recommended time frame for replacement.

You might also have a transmission fluid leak. Transmission fluid is a distinct red color. If you find fluid under your vehicle, you may have a bad gasket or connection somewhere. It’s best to take it to a professional to get it addressed. Do not attempt to drive your car if it has a significant transmission fluid leak, as severe damage could result.