Recall 14V669 affects 133 2015 Thomas Built Buses Saf-T-Liner Hdx school buses for fuel-filter separation. Repair is free at any franchised Thomas Built Buses dealer.
Thomas Built Buses is recalling 133 2015 Saf-T-Liner Hdx school buses because the recall involves Fleetguard UFF-XT fuel filters, part number FF63009, whose shells can separate from the nut plate. That separation can stall the engine without warning and increase crash risk; the dealer repair will be free once available.
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What's wrong?
The fuel filter on the 2015 Thomas Built Buses Saf-T-Liner Hdx is part of the diesel fuel system. Its job is to clean fuel before it reaches the Cummins ISB or ISL engine, while keeping fuel moving through a sealed housing at the pressure the engine needs. On these school buses, the filter identified in the recall is the Fleetguard UFF-XT fuel filter, part number FF63009.
The problem is inside that filter assembly. The outer filter shell can separate from the fuel filter nut plate, which is the mounting surface that helps hold the filter together and seal the fuel path. Once that separation happens, the engine no longer gets fuel the way it should. The engine can stall because the fuel supply is interrupted.
There is no warning sign before failure. The recall summary says the engine can stall without warning, so a driver should not expect a light, sound, or gradual change before the bus loses power.
Who's affected?
| 2015 Thomas Built Buses Saf-T-Liner Hdx | fuel system |
|---|---|
| Units affected | 133 |
| Field incidents | NHTSA has logged no field incidents to date. |
Not every 2015 Thomas Built Buses Saf-T-Liner Hdx bus is on the list. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
An unexpected engine stall increases the risk of a crash because the driver must react while the bus is losing power. Treat any stall as a reason to stop in a safe place and arrange service before continuing. Repair will be free at any franchised Thomas Built Buses dealer once available.
What should I do?
- Check your VIN to confirm your 2015 Thomas Built Buses Saf-T-Liner Hdx is included in this recall.
- Use the owner notice or dealer instructions to confirm the repair timing before scheduling service.
- Contact a franchised Thomas Built Buses dealer to schedule the free fuel-filter replacement that fixes the filter-shell separation that can stall the engine without warning.
- Reference recall number 14V669 and Thomas Built Buses recall FL-664 when you call.
- Drive cautiously until the repair is complete, and move the bus out of service if it stalls or shows fuel-system trouble.
What happens at the repair
The recall remedy is a fuel filter replacement. Once the dealer repair is available, a Thomas Built Buses technician replaces the Fleetguard fuel filter with a non defective fuel filter. Parts and labor are covered under the recall. DTNA has a general reimbursement plan on file for documented out of pocket repairs. If you already paid for a related fuel filter repair before the recall notice, contact DTNA or Cummins customer service with your repair paperwork and ask how to submit it under that plan.
| Reimbursement | Reimbursement available |
|---|
Timeline
| September 29, 2014 | Owner notification mailed |
|---|---|
| October 24, 2014 | NHTSA published the recall |
Frequently asked questions
What is recall 14V669?
Recall 14V669 covers 133 2015 Thomas Built Buses Saf-T-Liner Hdx school buses with Cummins ISB or ISL engines equipped with Fleetguard FF63009 fuel filters. The filter shell can separate from the nut plate, causing an engine stall without warning and increasing crash risk.
What should I do if my 2015 Thomas Built Buses Saf-T-Liner Hdx is on this recall?
Check your VIN to confirm your specific bus is included in recall 14V669. If it is, contact a franchised Thomas Built Buses dealer and reference recall FL-664 or NHTSA campaign 14V669. The dealer will replace the fuel filter with a non-defective one for free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair the defect at no cost, and the remedy for recall 14V669 is a free fuel-filter replacement. Thomas Built Buses dealers will install a non-defective filter, with Cummins support listed in the recall remedy.
What is the safety risk?
The safety risk is an unexpected engine stall. In recall 14V669, the Fleetguard fuel filter shell can separate from the fuel filter nut plate, stopping the engine without warning. If the bus stalls unexpectedly, crash risk increases.
What warning signs should I watch for?
There is no warning sign before failure in recall 14V669. The filing says the engine can stall without warning if the fuel filter shell separates from the nut plate. Confirm the VIN, then schedule the free fuel-filter replacement with a franchised Thomas Built Buses dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/14V669000 |
|---|---|
| Thomas Built Buses customer service | 1-800-745-8000 |
| NHTSA recall # | 14V669 |
| NHTSA recall # (full) | 14V669000 |
Source documents
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Download Misc. Document (PDF) - Download Recall Document (PDF) (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 1, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →