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Thomas Built Buses Saf-T-Liner C2 Recall 21V120: Engine Software May Fail to Limit Speed or Torque, Raising Crash Risk

NHTSA campaign 21V120, reported February 25, 2021, 159 vehicles potentially affected.

What this recall means for you

The engine control module software in certain school buses with Cummins B6.7N engines may be calibrated incorrectly. As a result, the engine may 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 functions do not work properly, the risk of a crash increases. Owners should take this seriously, especially for buses that carry students.

The repair is free. Cummins dealers will recalibrate the engine control module at no charge. Owners who received a notice can contact Daimler Trucks North America customer service at 1-800-547-0712, quoting recall number FL-879. You can also check your vehicle's VIN for open recalls.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 21V120Daimler Trucks North America, LLC
Component
ENGINE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
Problem
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.
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.
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.
Notes
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

Thomas Built Buses Saf-T-Liner C2201920202021