It's as if door actuator dosn't turn off when lowered.
Left headlight door makes a clicking sound when lowered ,butdoors raise&lower. on 2001 Pontiac Firebird
might be your gear motor go to you tube and they will show you how to change it. If its sounds like gridding noise they are a piece of plastic. Everything on are car is plastic. I have had more problems with my 01 WS6 trans am JUNK beautiful body but GM is losing in there quality