Vehicles require all sorts of maintenance to operate safely and efficiently. Contrary to popular belief, motorists need not be amateur mechanics to keep their vehicles running strong.

Major vehicle repairs are best left to the professionals, but drivers can learn to identify the causes of relatively minor issues that, if left untreated, can cause significant damage. For example, vehicles may exhibit certain signs that indicate their transmission fluid needs replenishing. In many of the following instances, drivers may only need to top off the transmission fluid in their vehicles. However, if issues persist, schedule an appointment with a mechanic.

• Overheated transmission: Smoke billowing from a car is a sight no driver wants to see. But as bad as it may look, smoke coming from a car may only indicate the transmission is overheating due to lack of fluid. Smoke also can be indicative of a host of other problems, so if transmission fluid levels are not low, consult a mechanic. Loss of power and a burning smell also may indicate low transmission fluid levels.

• Erratic shifting: Drivers can notice how their vehicles shift whether the cars or trucks have automatic or manual transmissions. Transmission fluid may be low if shifts appear to be delayed or faster than normal or if the vehicle appears to be slamming into a new gear. The automotive service provider Aamco notes that shifting issues related to transmission fluid may indicate the presence of a leak. If the issue disappears after refilling transmission fluid but then reappears shortly thereafter, consult a mechanic.

• Pausing when engaging gears: A two- to three-second pause when shifting into drive and reverse is another indicator that transmission fluid levels are low. The automotive experts at Firestone note that manual transmissions require fluid to keep gears lubricated, while automatic transmissions rely on fluid to create the hydraulic pressure necessary to power movement within the transmission. When fluid levels are low, shifting from park to drive or reverse can take longer than it should.

• Slipping transmission: Vehicles that are not staying in gear also may be in need of transmission fluid. However, a slipping transmission also may indicate significant damage to the transmission has already occurred, so this issue should be brought to the attention of a mechanic.

Low transmission fluid levels can contribute to various symptoms. Keeping an eye on fluid levels and recognizing low fluid symptoms can keep cars running smoothly.