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*Low transmission fluid level*: Check the transmission fluid level and add more if necessary.
*Dirty or contaminated transmission fluid*: Dirty or contaminated transmission fluid can cause the transmission to slip. Change the transmission fluid and filter if needed.
*Worn or damaged transmission parts*: Worn or damaged transmission parts can also cause the transmission to slip. This can include the torque converter, clutch plates, or gears.
*Faulty transmission control module*: The transmission control module (TCM) is responsible for controlling the transmission. A faulty TCM can cause the transmission to slip.
*Vacuum leak*: A vacuum leak can cause the transmission to slip. Check for any vacuum leaks and repair them if necessary.