I'm in Moab and cannot backup other than crawling without the brakes locking up like it is sensing serious slipping. No codes. No event that caused it - just drove 1200 miles from Texas. Have pulled fuses and relays related to ETS/BAS but with no help. Will even do it in neutral with the engine off but key on. 4Lo, same thing. Disconnected battery for 30 minutes. Any ideas?