The defect
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 engine control module software may be calibrated incorrectly, causing the engine to not limit engine speed or torque as intended for certain safety-related functions such as vehicle braking, traction and stability control, speed control, or collision avoidance.
The risk
If safety-related functions such as vehicle braking, stability, speed, and collision avoidance do not function properly, it can increase the risk of a crash.
The remedy
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. DTNA number for this recall is FL-879.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Thomas Built Buses SAF-T-Liner C2 | 2019, 2020, 2021 |
Components: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE | ENGINE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Thomas Built Buses SAF-T-Liner C2 | 2019 | 0 | 24 |
| Thomas Built Buses SAF-T-Liner C2 | 2020 | 1 | 16 |
| Thomas Built Buses SAF-T-Liner C2 | 2021 | 0 | 15 |
Other engine and engine cooling recalls in 2021
30 of the 988 recall campaigns reported to NHTSA in 2021 concerned the engine and engine cooling; Daimler Trucks North America, LLC filed 166 campaigns in all.
| 21V00G000 22 Dec 2021 | Alamo Group Inc. |
| 21V987000 16 Dec 2021 | Honda (American Honda Motor Co.) |
| 21V927000 25 Nov 2021 | Lamborghini (Automobili Lamborghini) |
| 21V865000 5 Nov 2021 | Yamaha Motor Corporation, USA |
| 21V843000 29 Oct 2021 | Mercedes-Benz USA, LLC |
| 21V837000 25 Oct 2021 | Navistar, Inc. |
| 21V838000 25 Oct 2021 | Navistar, Inc. |
| 21V819000 18 Oct 2021 | Kawasaki Motors Corp., U.S.A. |
NHTSA recalls (public domain) · all recalls of 2021