Thomas Built is recalling 13,593 school buses over interior joints too weak in a crash

Daimler Trucks North America has told federal safety regulators that 13,593 Thomas Built school buses may have interior joints too weak to meet the national crash-strength standard for school bus bodies. The campaign is filed as NHTSA 26V702000 and carries the company’s own number, F1044. Dealers will add fasteners to the joints at no cost to owners.

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The National Highway Traffic Safety Administration logged the report on October 22, 2026. It covers 2023 through 2027 Saf-T-Liner C2 Jouley buses, 2025 through 2027 Saf-T-Liner C2 buses, 2026 through 2027 Saf-T-Liner HDX2 buses and EFX2 school buses, and the count of potentially affected units is for the United States only. The record lists Daimler Trucks North America as the manufacturer behind the Thomas Built brand.

A pull test set at 60 percent of the weakest panel

The standard in question is Federal Motor Vehicle Safety Standard 221, which the Code of Federal Regulations says exists to “reduce deaths and injuries resulting from the structural collapse of school bus bodies.” Each body panel joint has to hold its panel to the member it is attached to when tested with a force equal to 60 percent of the tensile strength of the weakest panel joined. A joint that fails that test is a place where a bus body can peel apart under crash loads.

According to the dataset record NHTSA publishes, the problem here sits in the wheelhouse, the interior structure around the wheel well. Daimler’s filing says those interior body joints may have been built incorrectly, leaving them with insufficient strength, and the subject line on the record reads “Insufficient Interior Joint Strength/FMVSS 221.” The stated consequence is blunt: a school bus with insufficient joint strength may not adequately protect passengers in a crash.

Third trip through the same standard in three years

Thomas Built buses have been here before. In May 2023 the company filed recall 23V-333 on 23,603 Saf-T-Liner C2 buses built between January 24, 2020 and April 18, 2023. That report traced the weakness to an interior panel joint at the last rafter near the D-pillar, said production mis-installation was identified in mid-April 2023, and again prescribed mechanical fasteners as the repair. It listed no known warnings, accidents, injuries or deaths.

Seven months later came a smaller one. Daimler’s December 2023 filing, acknowledged by NHTSA on December 19 of that year, covered about 321 buses and a rear interior joint between the bulkhead and a window panel; the acknowledgment letter records the same remedy of dealer-installed fasteners. The 2026 campaign is far larger than that bulkhead recall and reaches into model year 2027, so buses assembled long after both earlier filings are in scope. Daimler’s 2023 report said production in the first campaign ended on April 18, 2023, which leaves more than three years of later production that now falls under a new joint-strength question.

Whether the 2026 filing involves the same joint design or a new one is not answered by the public record. The wheelhouse location differs from both earlier descriptions, so it reads as a separate location on the same body structure. Three campaigns, three different joints, one federal standard: that pattern is the part of the story the filings do not explain, and the company has not published an account of why interior joints keep turning up.

Fasteners now, letters on December 21

The repair itself is simple on paper. Dealers add fasteners to secure the joints, and owners pay nothing. The slower part is the paperwork: the filing says owner notification letters are expected to be mailed on December 21, 2026, about two months after NHTSA received the report. School districts and contractors that operate affected buses do not have to wait for that mailing to act, because the campaign numbers are public and can be given to a dealer directly.

Fleet managers can also run a vehicle identification number through the lookup at NHTSA’s recalls page, which advises checking twice a year. The same page cautions that the search may not cover recent recalls where not every VIN has been identified yet, so a clean result for a bus built in the last two model years is not a final answer. Calling the dealer with campaign 26V702000 or Daimler’s F1044 settles it.

Gaps in Daimler’s recall filing

Nothing in the fields available for this campaign says how Daimler found the weakness, whether any crash, injury or warranty claim prompted the report, or how many of the 13,593 buses actually carry a deficient joint. A 2023 report on the earlier campaign disclosed its chronology; the 2026 chronology had not been published in the dataset fields reviewed for this article, so the timeline from discovery to filing is unknown.

That gap matters most for the newest buses. Model year 2027 vehicles are covered, and they are the ones with the least time on the road. The first public test of the fix will be the mid-December mailing: if letters go out on schedule, owners of the 13,593 buses will receive written notice only in the last ten days of 2026, and the free fastener work can be booked from then.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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