Dirty transmission fluid causes problems when shifting gears: grinding noises, stalling or misfiring of the engine and overheating of the transmission. These problems are very similar to those caused by low transmission fluid.Continue Reading
Dirt restricts the flow of transmission fluid and prevents the transmission from developing the amount of pressure and hydraulic power necessary for shifting gears. It causes gears to slip, respond sluggishly or not respond at all. For instance, a car may stall for a short while right after shifting gear but before it starts moving. Dirty transmission fluid can also clog the transmission filter and prevent proper gear lubrication. This leads to excessive wear and premature failure of the clutches and bands that enable the gears to change. These worn-out parts cause grinding noises when shifting gears.
Transmission fluid is supposed to keep the transmission temperature in check, but dirty fluid clogs the cooler lines, causing the transmission to overheat. Dirt in the transmission also causes inconsistencies in the flow of transmission fluid that result in the car jumping forward or falling back slightly while driving. To avoid these problems, dirty transmission fluid should be drained and replaced every 30,000 miles, every two years, or when it turns dark brown or black from dirt. If the filter is clogged, it should also be cleaned or replaced.Learn more about Transmission
A transmission can prompt a whining noise if the operating system has malfunctioned, the gears are not operating correctly or the transmission fluid needs to be changed.Full Answer >
Signs of a bad transmission include clunking, whining and humming; lack of response while driving, such as when a car seems to have trouble switching gears; grinding or shaking; and low or leaking fluid. A burning smell, a dragging clutch and a noisy car in neutral are other warning signs.Full Answer >
When transmission fluid is low, the transmission tends to jerk or slip when changing gears. The vehicle may also speed to high revolutions per minute while in neutral or without the vehicle speeding up or spontaneously slip out of gear. A burning smell is another sign that transmission fluid may be low.Full Answer >
Some signs of transmission problems are the transmission refusing to go into gear, the smell of burning transmission fluid and noises coming from the transmission when the car is in neutral. Other signs are gears slipping, a dragging clutch and leaking transmission fluid.Full Answer >