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Service campaign S4373-202502

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService campaign
NHTSA id11014712
Published by NHTSA2025-03-03
Manufacturer's numberS4373-202502
Manufacturer's date2025-02-28
NHTSA componentSTRUCTURE:BODY; UNKNOWN OR OTHER

NHTSA's summary

Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient number of welds across the rear flange of the upper header. The reduced number of welds could lower the designed cab integrity.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Body and frame

Vehicles listed
MACK ANTHEM (AN)2025 (the catalog's model; the bulletin names a series or trim of it)
MACK PIONEER PR (4)2025 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
26V6310002026-10-01. STRUCTURE:BODY:BUMPERS:ACTIVE SHUTTERS/GRILL; STRUCTURE:EXTERIOR TRIM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CBR 2429 2026082026-09-01. Service bulletin. This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch Panels and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
CBR 2575-1 2026042026-05-05. Service bulletin. CBR - Mack Chassis - Dash Panel Cracking at Mounting to BIW.
CBR 2540-7 2026042026-05-05. Service bulletin. CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
S4866 0320262026-04-02. Service campaign. SC - Load Lock Clamp Install
S4808 0320262026-04-02. Service campaign. SC - Certain model PR’s could experience grille surround trim detaching due to insufficient retention.
S4373 0220262026-03-03. Service campaign. SC - Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient number of welds across the rear flange of the upper header
CBR 2540-5 2026012026-02-03. Service bulletin. CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
CBR 2432-2 2026012026-02-03. Service bulletin. CBR - Mack Chassis - AN And GR Models - Door Glass Shattering.
CBR 2399-9 2026012026-02-03. Service bulletin. CBR - Daycab Cab Roof Antenna Misalignment Causing Water Intrusion.
CBR 2540 2025122026-01-06. Service bulletin. Upper Bunk Restraint System – Plastic Gable Retention Field Fix