# Service campaign S4373 022026

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.

- Type: Service campaign
- NHTSA id: 11029455
- Published by NHTSA: 2026\-03\-03
- Manufacturer's number: S4373 022026
- Manufacturer's date: 2026\-02\-26
- NHTSA component: STRUCTURE:BODY

## NHTSA's summary

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

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029455-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029455-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Body and frame

## Vehicles listed

- 2025 MACK ANTHEM \(AN\)
- 2025 MACK PINNACLE \(PI/PN\)

## Other bulletins for the same vehicles and component

- [CBR 2575\-1 202604](/bulletins/11032094.md), 2026-05-05, Service bulletin: STRUCTURE:BODY; UNKNOWN OR OTHER. CBR \- Mack Chassis \- Dash Panel Cracking at Mounting to BIW.
- [CBR 2432\-2 202601](/bulletins/11028041.md), 2026-02-03, Service bulletin: STRUCTURE:BODY; VISIBILITY/WIPER. CBR \- Mack Chassis \- AN And GR Models \- Door Glass Shattering.
- [S4373\-202502](/bulletins/11014712.md), 2025-03-03, Service campaign: STRUCTURE:BODY; UNKNOWN OR OTHER. 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.
- [CBR\-2384 202407](/bulletins/11005412.md), 2024-08-01, Service bulletin: STRUCTURE:BODY. CBR: Mack Chassis \- Day Cab Glass Breakage
- [CBR\-2384 202406](/bulletins/11003043.md), 2024-07-03, Service bulletin: STRUCTURE:BODY; VISIBILITY/WIPER; UNKNOWN OR OTHER. CBR \- Mack Chassis \- Day Cab Glass Breakage

JSON: [/v1/bulletins/11029455](/v1/bulletins/11029455)

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