2015 Thomas Built Buses Saf-T-Liner HDX Recall: Cummins ISB or ISL engines in these vehicles may have been equipped with…
NHTSA campaign 14V669000 · Fuel System, Diesel · filed Oct 24, 2014 · verified Jul 30, 2026
The defect
Daimler Trucks North America LLC (DTNA) is recalling certain model year 2015 Thomas Built Buses Saf-t-liner school buses manufactured May 2, 2014, to July 31, 2015. The Cummins ISB or ISL engines in these vehicles may have been equipped with Fleetguard UFF-XT fuel filters, part number FF63009, whose filter shell may separate from the fuel filter nut plate causing the engine to stall without warning.
The risk
If the engine stalls unexpectedly there is an increased risk of a crash.
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
Cummins has notified owners on behalf of DTNA, and dealers will replace the fuel filter with a non-defective one, free of charge. The recall began in late September 2014. Owners may contact DTNA customer service at 1-800-745-8000 or Cummins customer service at 1-800-223-4583. DTNA's number for this recall is FL-664.
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.safercar.gov.
Affected vehicles
| Make | Model | Model years |
|---|---|---|
| Thomas Built Buses | Saf-T-Liner HDX | 2015 |
Related recalls
More Thomas Built Buses Saf-T-Liner HDX recalls
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Other campaigns involving Thomas Built Buses vehicles
- 2026–2027 Thomas Built Buses Saf-T-Liner EFX2 and 1 other model — Entrance door may fail to open or close when the switch is…
- 2026–2027 Thomas Built Buses Saf-T-Liner HDX2 — Entrance door may fail to open or close when the switch is…
- 2027 Thomas Built Buses Saf-T-Liner HDX2 — Front and mid-body interior joints may have been…
All Thomas Built Buses Saf-T-Liner HDX recalls → · All Thomas Built Buses recalls →
Source: NHTSA recall database, campaign 14V669000 (manufacturer number FL-664). Data last verified Jul 30, 2026.