2008–2015 Thomas Built Buses Saf-T-Liner HDX Recall: Excessive engine crankcase pressures may cause the 90-degree elbow of the…
NHTSA campaign 15V344000 · Engine and Engine Cooling · filed Jun 3, 2015 · verified Jul 30, 2026
The defect
Daimler Trucks North America LLC (DTNA) is recalling certain model year 2008-2015 Thomas Built Buses Saf-T-Liner HDX school buses manufactured May 25, 2008, to December 18, 2014, and equipped with certain Cummins Westport ISL G engines. Excessive engine crankcase pressures may cause the 90-degree elbow of the vent tube assembly to detach from the crankcase ventilation breather, possibly allowing engine oil to come into contact with hot surfaces.
The risk
If engine oil comes into contact with a hot surface, there is an increased risk of a fire.
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 will notify owners on behalf of DTNA, and dealers secure the ends of the 90-degree elbow. In addition, the electronic control module (ECM) will be reprogrammed with software that can adjust the engine output under misfire conditions to limit crankcase pressures. These repairs will be performed free of charge. The recall began on June 12, 2015. Owners may contact DTNA customer service at 1-800-745-8000, or Cummins customer service at 1-800-343-7357. DTNA's number for this recall is FL-681.
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 | 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 |
Related recalls
More Thomas Built Buses Saf-T-Liner HDX recalls
- 2023–2026 Thomas Built Buses Saf-T-Liner Efx and 1 other model — Heater hose clamps may not have been tightened properly…
- 2023–2025 Thomas Built Buses Saf-T-Liner Efx and 1 other model — Heater hose clamps may not have been tightened properly…
- 2025–2027 Thomas Built Buses Minotour DRW and 4 other models — Wheel chair restraint retractor may not lock, preventing…
- 2025–2026 Thomas Built Buses Saf-T-Liner C2 and 4 other models — Tie rod castle nut and cotter pin may not be installed…
- 2019–2022 Thomas Built Buses Minotour DRW and 5 other models — Emergency Exit Label lettering is too small and may be…
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 15V344000 (manufacturer number FL-681). Data last verified Jul 30, 2026.