Thomas Built Buses Recalls Saf-T-Liner C2 School Buses for Engine Software Defect
Daimler Trucks North America is recalling 2019-2021 Thomas Built Buses Saf-T-Liner C2 school buses because engine software may fail to limit speed or torque, increasing crash risk.
What this means for you
Our assessment, not the agency’s: severity 4/5 (Severe).
The hazard poses a serious risk of illness, injury, or structural failure. Stop using the product immediately and contact the manufacturer for a refund or repair.
Our severity reasoning: The recall involves a structural vehicle defect where safety-related functions like braking and stability control may fail, which aligns with the rubric criteria for a Severe (4) rating.
Plain-English summary
Daimler Trucks North America, LLC (DTNA) is recalling certain 2019-2021 Thomas Built Buses Saf-T-Liner C2 school buses equipped with Cummins B6.7N engines. The recall involves 159 vehicles.
The engine control module software may be calibrated incorrectly, causing the engine to not limit engine speed or torque as intended for safety-related functions such as vehicle braking, traction and stability control, speed control, or collision avoidance. If these safety-related functions do not function properly, it can increase the risk of a crash.
DTNA will work with the engine manufacturer Cummins Inc. to notify owners, and Cummins dealers will recalibrate the engine control module, free of charge. Owner notifications were mailed on March 29, 2021. Owners may contact DTNA customer service at 1-800-547-0712 or the NHTSA Vehicle Safety Hotline at 1-888-327-4236.
The recalled product
- Product
- THOMAS BUILT BUSES SAF-T-LINER C2
- Brand
- THOMAS BUILT BUSES
- Manufacturer
- Daimler Trucks North America, LLC
- Category
- Vehicle — School Bus
- Affected units
- 159
Is your product affected?
Check your packaging against the codes below. If any of them match, the product is part of this recall.
Model numbers (1)
- SAF-T-LINER C2
Distribution
Distributed nationwide across the United States.
Related recalls
Same brand · THOMAS BUILT BUSES
- HighThomas Built Buses Recalls 2027 Saf-T-Liner C2 School Buses
NHTSA · 2026-10-21
- High2027 Thomas Built Buses Recall for Headlight Software Error
NHTSA · 2026-10-01
- Severe
- Severe
- Severe
Same manufacturer · Daimler Trucks North America, LLC
See all →- SevereFreightliner and FCCC Trucks Recalled for Fuel Hose Separation Risk
NHTSA · 2026-10-07
- SevereFreightliner Recalls Business Class M2 Trucks for Fire Risk
NHTSA · 2026-10-01
- Severe
Same hazard · crash risk
See all →- SevereKoenigsegg Recalls CC850 Vehicles Due to Electronic Parking Brake Defect
NHTSA · 2026-10-21
- SevereFord Recalls ABS Modules With Incorrect Software Programming
NHTSA · 2026-10-20
- SevereHyundai Recalls 2026 Tucson Hybrid and Elantra for Steering Control Risk
NHTSA · 2026-10-20
- SevereLexus NX Vehicles Recalled for Instrument Panel Display Failure
NHTSA · 2026-10-20
- HighLand Rover Range Rover Recall for Rearview Camera Drainage Issue
NHTSA · 2026-10-15
Similar recalls
- Severe
- HighDaimler Recalls 2016 Thomas Built Buses Due to Engine Stalling Risk
NHTSA · 2015-10-05
- SevereThomas Built Saf-T-Liner C2 School Bus Recall for Transmission Software
NHTSA · 2013-12-16
- SevereThomas Built Buses Recalling 2019-2023 Models for Engine Shutdown Risk
NHTSA · 2022-06-20
- Severe2023 Thomas Built School Buses Recalled for Engine Control Module Defect
NHTSA · 2022-07-29
- Severe