2021 New Flyer XD35, 2021 New Flyer XD40 Recall: Engine calibration software's management of the injection of Diesel…
NHTSA campaign 21V532000 · Engine and Engine Cooling · filed Jul 14, 2021 · verified Jul 30, 2026
The defect
New Flyer of America, Inc. (New Flyer) is recalling certain 2021 XD35 and XD40 vehicles equipped with 2021 Model Year Cummins L9 Diesel Engines. The engine calibration software's management of the injection of Diesel Exhaust Fluid can allow excessive ammonia to be emitted from tailpipe exhaust.
The risk
Exposure to high levels of ammonia can increase the risk of injury.
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 recalibrate the engine, free of charge. Owner notification letters were mailed on July 23, 2021. Owners may contact New Flyer's customer service at 1-800-204-224-6706. New Flyer's number for this recall is R21-013.
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.nhtsa.gov.
Affected vehicles
Related recalls
More New Flyer XD35 recalls
- 2016–2026 New Flyer XD35 and 15 other models — Please refer to New Flyer's recall report for specific…
- 2024 New Flyer XD35 and 3 other models — Remote fuel filter hoses may separate from the fitting…
- 2023 New Flyer XD35 and 2 other models — Remote fuel filter hoses may become separated from the…
- 2022–2023 New Flyer XD35 and 7 other models — Due to a software error, unintended acceleration may occur…
- 2019–2024 New Flyer XD35 and 3 other models — Transmission yoke may separate, resulting in driveshaft…
Other campaigns involving New Flyer vehicles
Source: NHTSA recall database, campaign 21V532000 (manufacturer number R21-013). Data last verified Jul 30, 2026.