General symptoms:
* Difficulty shifting gears
* Slipping or delay when shifting
* Jerks or jerks when shifting
* Extraneous noises such as humming, howling or grinding
* Burning or liquid smell
* Fluid leak from gearbox
Specific symptoms for Mercedes-Benz transmissions:
Seven-speed automatic transmissions (7G-Tronic):
* Shuffling or sliding when downshifting
* Noise when engaging reverse gear
* Noticeable gap between Park and Drive positions
Five-speed automatic transmissions (5G-Tronic):
* Jerking when upshifting
* Problems engaging reverse gear
Four-speed automatic transmissions (4G-Tronic):
* Slipping when switching
* Delay when shifting from low to high gear
CVTs (CVT):
* Vibration or noise when accelerating
* Stuck at high speeds at constant speed
Additional symptoms indicating serious problems:
* Complete loss of transmission power
* Inability to change gears
* Red or brown transmission fluid