Daimler Trucks North America is recalling certain 2019-2021 Thomas Built Buses Saf-T-Liner C2 school buses with Cummins B6.7N engines. The engine control module software may cause braking, stability, or collision avoidance failures, increasing crash risk. Owners must contact DTNA for free recalibration.
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.
Daimler Trucks North America is recalling 2019-2021 Thomas Built Buses Saf-T-Liner C2 school buses with Cummins B6.7N engines. The engine control software might not properly limit speed or torque, which could lead to braking or stability problems and increase crash risk. Read more at govinfonow.com/recall/80069-thomas-built-buses-saf-t-liner-c2-2020-engine-recall.
Source Summary by GovInfoNow · govinfonow.com/recall/80069-thomas-built-buses-saf-t-liner-c2-2020-engine-recall · Updated October 4, 2026 · Official notice: NHTSA #21V120000
“Thomas Built Buses Saf-T-Liner C2 (2020) Engine Recall: Risk of Crash Due to Braking Issues.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/80069-thomas-built-buses-saf-t-liner-c2-2020-engine-recall. Based on NHTSA recall 21V120000 (https://www.nhtsa.gov/recalls?nhtsaId=21V120000).
The engine control module software may be calibrated incorrectly, causing the engine to not limit speed or torque properly. This can affect braking, traction, stability control, speed control, and collision avoidance systems, potentially increasing crash risk during normal operation.
School bus owners who purchased a 2019-2021 Thomas Built Buses Saf-T-Liner C2 with Cummins B6.7N engine are most at risk. These buses are used for school transportation, so children's safety is a key concern.
Check if your school bus has a Thomas Built Buses Saf-T-Liner C2 model with a Cummins B6.7N engine from 2019 to 2021. The recall covers these specific years and engine types.
Call DTNA customer service at 1-800-547-0712 to schedule free engine recalibration by a Cummins dealer.
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.
The engine control module software may be calibrated incorrectly, causing the engine to not limit speed or torque properly for safety functions like braking and stability.
Check if your Thomas Built Buses Saf-T-Liner C2 school bus has a Cummins B6.7N engine from 2019 to 2021.
Contact DTNA customer service at 1-800-547-0712 to arrange free recalibration of the engine control module by a Cummins dealer.
We’ve drafted a message you can send Thomas Built Buses to request your refund or repair — edit it as you like.
Subject: Recall 21V120000 — Thomas Built Buses Thomas Built Buses Hello, I own a Thomas Built Buses that is covered by recall 21V120000 from Thomas Built Buses. The official recall notice states: 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. I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this? Thank you.
Experiences, tips, and questions from readers. Every comment is reviewed before it appears.
No comments yet — be the first to share your experience.
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
