I have not run into this problem my self but will try to help to the best of my ability first remove negative battery cable and check fuses for a blown fuse look for fuse markedECU-B ECU -IG EFI IGN if none found than pull connecter from sas/ops and check for water in connecter or loose connection next do same to engine controller and same to muilti fuction display harness connectors will do labeled A21 A20 A36 AQ Q2 next put back all harness connection and negative cable and turn key on and see if code goes away if not you must take continuity readings and look for short in harness start atA21-8 ECU-B continuity A21-1ECU-IG continuity A21-2-ECU-IG continuity Q-2-ECU-IGcontinuity A20-12-Q2-5continuity A20-13 -Q2-6 continuity A20-12-A36-28continuity A20-13 -A36-29continuity A20-12-frame no continuity A20-13-frame no continuity A36-3 EFi continuity A36-9 IGN continuity if no problem replace sas/ops controller