Audi A4C B6 starts preo does not accelerate

Good morning friends, sorry to bother you. My Audi was hit on the driver's side door, a decent impact, but it turns out that immediately upon starting it, the engine runs, but when I try to accelerate, it only revs up to about 800 rpm and then drops, and this happens repeatedly. I assume logically that the gears aren't engaging either. It's worth mentioning that the gear indicator on the dashboard is flashing.