New Flyer Xd35, New Flyer Xd40, model year 2021. Filed by New Flyer of America, Inc. and reported to NHTSA on 14 July 2021. 28 vehicles potentially affected.
What the notice says 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.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
New Flyer's own number for this recall: R21-013. That is the number on the owner letter and on the dealer paperwork. 21V532 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V532 cover?
- New Flyer XD35, New Flyer XD40, model year 2021.
- What is wrong with them?
- 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.
- What can happen if it is not put right?
- Exposure to high levels of ammonia can increase the risk of injury.
- Is there a fix yet?
- Yes, and it is free. 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.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. New Flyer calls this recall R21-013, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “Exposure to high levels of ammonia can increase the risk of injury.”
affected
in the notice
caught
| Campaign | 21V532 |
|---|---|
| Filed by | New Flyer of America, Inc. |
| System at fault | Engine And Engine Cooling:Exhaust System:Manifold/Header/Muffler/Tail Pipe |
| Reported to NHTSA | 14 July 2021 |
| Model years | 2021-2021 |
| Vehicles named | NEW FLYER XD35, NEW FLYER XD40 |
What the notice says today
The consequence
Exposure to high levels of ammonia can increase the risk of injury.
The remedy
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.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 588 notices in the record whose component field names engine and engine cooling. Across that group the median wait before owners were written to was 47 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 21V532, wording as read on 16 September 2026. https://carsmultiverse.com/recall/21v532/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other New Flyer notices we hold
- 26V279: 2022 XE40 transit buses
- 26V151: 2021-2025 XE35, 2021-2026 XE40, 2023-2025 XE60, 2023-2026 XHE40, and 2024-2026 XHE60 transit buses equipped with Accelera ELFA 3 control systems V1 and V2
- 25V898: XD35, XDE35, XE35, XN35, XD40, XDE40, XE40, XHE40, XN40, XT40, XD60, XDE60, XE60, XN60, XT60, and XHE60 transit buses
- 25V631: 2019 XE35, 2021-2025 XE35, XE40, and XE60 transit buses
- 25V566: 2013, 2017-2025 XE40, 2019-2025 XE60, XE35, 2023-2025 XHE40, and 2024-2025 XHE60 buses
- 25V542: 2012-2025 Xcelsior buses
- 25V053: 2023-2024 XDE60, 2024 XD35, XD40, and XD60 transit buses equipped with Cummins L9 diesel engines
- 24V425: 2023 XD35, XD40, and XD60
All 43 New Flyer campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 21V532 on 23 August 2026, they were:
- Defect summary
8a6dfbc8 - Consequence
200260c9 - Remedy
c0e82b9e
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 21V532 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the New Flyer XD35, in all seven, is kept on that vehicle's own page, with the newest in each.
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Owners of these cars
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