Slipping gears
Delayed engagement when shifting into drive or reverse
Hard or rough shifting
Grinding or shaking during gear changes
Transmission warning light on the dashboard
Burning smell
Transmission fluid leaks
Low or dark, dirty transmission fluid
Whining, humming, or clunking noises
Vehicle hesitates or loses power while accelerating
Gears popping out unexpectedly
Check engine light with transmission-related codes
Transmission overheating
Car won’t move in certain gears
RPMs rise without a corresponding increase in speed