2022 Thomas Built Buses Saf-T-Liner HDX Recall: Fan drive pulley assembly bolts may be incorrect or improperly installed
NHTSA campaign 21V714000 · Engine and Engine Cooling · filed Sep 15, 2021 · verified Jul 30, 2026
The defect
Daimler Trucks North America, LLC (DTNA) is recalling certain 2022 Thomas Built Buses Saf-T-Liner HDX school buses. The fan drive pulley assembly bolts may be incorrect or improperly installed. Incorrect or improperly installed bolts may lead to a loose fan belt, resulting in a disabled bus.
The risk
A disabled school bus may require an evacuation procedure in an uncontrolled traffic situation, 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
DTNA will inspect and repair the fan drive pulley assembly mounting bolts as necessary, free of charge. Owner notification letters were mailed on November 12, 2021. Owners may contact DTNA's customer service at 1-800-547-0712. DTNA's number for this recall is FL-902.
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
| Make | Model | Model years |
|---|---|---|
| Thomas Built Buses | Saf-T-Liner HDX | 2022 |
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All Thomas Built Buses Saf-T-Liner HDX recalls → · All Thomas Built Buses recalls →
Source: NHTSA recall database, campaign 21V714000 (manufacturer number FL-902). Data last verified Jul 30, 2026.