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Service bulletin TSIB 26-05

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 bulletin
NHTSA id11034101
Published by NHTSA2026-06-26
Manufacturer's numberTSIB 26-05
Manufacturer's date2026-06-11
NHTSA componentENGINE

NHTSA's summary

This bulletin introduces an optional product improvement to the A/C compressor drive system for coaches equipped with a Cummins X12. The improved pulley system is available for customers who wish to reduce noise and vibration characteristics and may be installed at the customer’s discretion.

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

Engine

Vehicles listed
MCI D40002018 to 2022
MCI D4000ISTV2018 to 2023
MCI D40052018 to 2021
MCI D40202026
MCI D4020ISTV2024 to 2026
MCI D45002018 to 2024
MCI D45052018 to 2024
MCI D45202020 to 2026
MCI D45CRT2024 to 2026
MCI D45CRTLE2018 to 2025
MCI J45002018 to 2026

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