So I have a 2023 Sierra less than 6000kms I got a Check engine air filter system message about two weeks ago took it to the dealership and they said it was a glitch and nothing was wrong. Today it comes back mind you I think I lifted the hood once to put windshield washer in so no mods whatsoever and obviously something is wrong I took it a friend’s shop and he put his scan tool on it and said no codes. Any suggestions or thoughts would be appreciated
Thanks in advance