2014–2022 Thomas Built Buses Saf-T-Liner Efx, 2014–2023 Thomas Built Buses Saf-T-Liner HDX Recall: Passenger seat frames may crack and rotate from fatigue
NHTSA campaign 22V510000 · Seats · filed Jul 19, 2022 · verified Jul 30, 2026
The defect
Daimler Trucks North America, LLC (DTNA) is recalling certain 2014-23 Thomas Built Buses HDX and 2014-22 EFX school buses equipped with 39-inch S3C seat frames and 3-point flex seatbelts. The passenger seat frames may crack and rotate from fatigue.
The risk
Cracked passenger seat frames may not adequately secure passengers in the event of a crash, increasing the risk of injury.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will secure the seat frames with brackets, free of charge. Owner notification letters were mail December 4, 2023. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL946.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.
Affected vehicles
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All Thomas Built Buses Saf-T-Liner Efx recalls → · All Thomas Built Buses recalls →
Source: NHTSA recall database, campaign 22V510000 (manufacturer number FL946). Data last verified Jul 30, 2026.