Lincoln Nautilus 2025–2026 — technical service bulletin
Bulletin SSM 54400 · NHTSA communication 11025822 · issued Nov 25, 2025
Technical service bulletin
communication type
Seats
component
2025–2026
model years
2
vehicle entries
Official summary
Some 2025-2026 Nautilus vehicles with heated-only front seats (minor feature code BY1AC) (not heated and cooled) may set diagnostic trouble codes (DTCs) B103A:15, B1034:13, B1036:13, and B1038:15 in the heating, ventilation, and air conditioning (HVAC) module when a diagnostic self-test is performed. These DTCs have no effect on functionality and should be ignored if no other DTCs are present in the HVAC module and no symptoms are present. Continue with diagnosing any other HVAC DTCs first. No further service action is required.<br /><br /> To confirm a vehicle is built with a certain minor fe
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.