Rear air compresser syas running why what can i do on 1998 GMC Envoy

my 1998 rear air compresser stays on and my service engine light stays on how do get the rear air compresser off and light

Asked by for the 1998 GMC Envoy
you more than likely have an air leak that wont allow pressure to build. get it checked out and a bid. i do not think the check engine light has anything to do with it. get it checked at the same time