Front seat safety restraint system fault (RCM_a021/a056)
AIR BAGS, SEAT BELTS, SEATS
70 NHTSA complaints · 2024-06 → 2026-06 (sample of 200 most-recent of 975 total)
“My 2018 Tesla Model 3 began showing a "front passenger safety restraint fault" alert within the last week or so. I scheduled service and then received an estimate of almost $1000. When I corresponded with Tesla through their app, they told me the diagnostic code is…”
“I randomly received an alert indicating “Front passenger safety restraint system fault” on my Tesla’s display. When I look this up, it indicates that the airbag may not deploy correctly in the event of an accident due to a seat sensor malfunction. When I contacted the service…”
“Started receiving Error RCM_a056 Front Passenger Safety Restraint System Fault. The vehicle shows that the passenger airbags are DISABLED after the alert is issued. I am working under the assumption that all passenger airbags (front, side, overhead) are currently disabled at all…”
“When seat is moved up for my [XXX] daughter, who is learning to drive, it now triggers an error an indicates the air bags will not work. The error code is RCM_a021. It seems the vehicle has a defect that over time the connections for the front seat harnesses will fail. This is a…”

