Vehicle recall 21V850000 · November 2, 2021
Thomas Built Buses SAF-T-Liner EFX and SAF-T-Liner HDX
The nut for the power cable stud on the alternator may not have been tightened properly, which can cause a loose cable connection.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- Daimler Trucks North America, LLC (DTNA) is recalling certain 2020-2022 Thomas Built EFX and HDX school buses. The nut for the power cable stud on the alternator may not have been tightened properly, which can cause a loose cable connection.
- Consequence
- A loose power cable connection may cause electrical arcing, which can increase the risk of a fire.
- Remedy
- Dealers will inspect the alternator power cable connection and tighten it if necessary, free of charge. Owner notification letters were mailed on December 17, 2021. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL904.
- Notes
- 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.
Recall details
- NHTSA campaign
- 21V850000
- Reported to NHTSA
- November 2, 2021
- Filed by
- Daimler Trucks North America, LLC
- Manufacturer campaign
- FL904
- Owner notification
- December 17, 2021
- Vehicles potentially affected
- 1,434
- Initiated by
- the manufacturer
- Components
- Electrical system › Alternator/generator/regulator
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Thomas Built Buses SAF-T-Liner EFX (2020-2022): 2022, 2021, 2020
- Thomas Built Buses SAF-T-Liner HDX (2020-2022): 2022, 2021, 2020
Has your Thomas Built Buses been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Thomas Built Buses dealer can also check your VIN. Recall repairs are free.