Grille trim can fly off 3,096 new Mack trucks into the traffic behind them

Mack Trucks has told federal regulators that the intake and grille bezels on 3,096 of its Anthem and Pioneer highway trucks may not stay on, leaving trim that can come off while the truck is moving and land in the path of whatever is following. NHTSA logged the filing on Oct. 1, 2026 as campaign 26V631000. It covers 2026-2027 Anthem AN models and 2025-2027 Pioneer PR models, and Mack tracks the action internally as SC0501.

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These are recent builds. Mack’s safety report puts 2,868 of the trucks in the Pioneer line, built between Oct. 22, 2024 and Sept. 18, 2026, and the other 228 in the Anthem line, built between July 2, 2025 and Feb. 13, 2026. The company lists itself as the Tier 1 supplier of the bezels, at its site in Greensboro, North Carolina, and estimates that 6.1% of the trucks actually carry the defect.

Bezel clips that never fully engage

The cause, as laid out in Mack’s Part 573 defect report, is a fitment problem. The bezels around the top intake and the grille did not mate cleanly with their mounting surfaces, so the clipping mechanisms did not fully engage during assembly and the trim may not be adequately secured. The report does not mention adhesive. It does describe how a bad clip shows itself: a slightly larger gap along the outboard side of the bezel, which makes the fault something a technician can spot with a walk-around of a parked truck, before any piece of trim has gone missing on the road.

NHTSA’s dataset entry for the campaign states the hazard in six words: “Intake and grille bezels may detach and become road hazards.” The agency’s campaign record adds the consequence, that a detached bezel can become a road hazard for other vehicles and raise the risk of a crash. Mack’s report states that it knows of no accidents or injuries tied to the problem, and its related-recall field is blank, so no earlier NHTSA campaign on these bezels is cited.

243 warranty claims and a six-month paper trail

The count of complaints behind the decision is specific: 243 warranty claims and 95 field reports. Mack’s chronology starts on March 18, 2026, when its safety office was notified and an investigative case was opened. A product safety evaluation committee recommended escalation the next day, and on March 25 the product safety committee asked for more information. A second evaluation on Sept. 14 again recommended escalation, and on Sept. 24 the committee determined that a safety defect exists and decided to recall. The Part 573 report followed on Oct. 1.

One detail in that timeline stands out. The last Pioneers covered by the recall left the line on Sept. 18, four days after the second evaluation recommended escalation and six days before the committee made its call. Trucks were still being assembled with the suspect bezel fit while the decision was pending, which is why the remedy has to cover trucks built right up to the day the committee voted. The Anthem group finished earlier: its build window closed on Feb. 13, 2026, more than a month before Mack’s safety office was first notified on March 18, so every Anthem in the recall was already finished before the investigation opened.

Put together, the 243 warranty claims and 95 field reports make 338 documented complaints against 3,096 trucks, roughly one for every nine units in the group. Mack does not break the 338 down by model line or by which bezel came loose, and its report does not say whether any piece of trim reached the road. What it does say is that no accidents or injuries are known, and that the company’s committees spent more than six months weighing it before deciding it met the definition of a safety defect.

Redesigned intake bezels, cable ties on the grille

The repair differs by part. Mack says the intake bezels will be replaced with current versions that have improved clip-tower clearance, which addresses the fitment fault at its source. The grille bezels get a different treatment: holes are added and cable ties fastened through them, a mechanical backup for a clip that might let go. Dealers will inspect each truck and do the work free of charge, and NHTSA’s description says the cable ties are installed as needed.

Owner letters are expected to be mailed Nov. 30, 2026. NHTSA said the VINs of affected trucks would become searchable on its recall page for the campaign on Oct. 8, 2026, weeks before the letters, which matters to fleets that buy or resell tractors and want to confirm a unit before taking delivery. Mack customer service takes calls at 1-800-866-1177, and the recall should be referenced as SC0501.

The scale of the problem is easier to read in the numbers Mack supplied. A 6.1% defect estimate applied to 3,096 trucks works out to roughly 189 trucks with a bezel that is actually poorly seated, and the recall still counts all 3,096, so the other 2,900-odd trucks are inspected too. Pioneers make up about 93% of the group, a reflection of a build window that ran almost 23 months against the Anthem’s seven. NHTSA’s dataset extract for the campaign carries Mack’s campaign number SC0501 and the Oct. 1 receipt date.

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

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