So a few days ago my Envoy started acting weird when braking. It always seems to happen when the truck slows down to the 10mph range which I can then hear the ABS. The ABS Light comes on and off, sometimes with the Parking Brake light and Service Brake System on the DIC. I went to AutoZone and had them check for codes. This is what i got, C0237, C0223, C0269, C0222, C0305, C0306, C0321, C0327, C0359, C0374, C0550. It's too late to take into a shop right now, so hoping someone can chime in in the mean time.