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.
| Type | Service bulletin |
|---|---|
| NHTSA id | 11034101 |
| Published by NHTSA | 2026-06-26 |
| Manufacturer's number | TSIB 26-05 |
| Manufacturer's date | 2026-06-11 |
| NHTSA component | ENGINE |
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
| MCI D4000 | 2018 to 2022 |
|---|---|
| MCI D4000ISTV | 2018 to 2023 |
| MCI D4005 | 2018 to 2021 |
| MCI D4020 | 2026 |
| MCI D4020ISTV | 2024 to 2026 |
| MCI D4500 | 2018 to 2024 |
| MCI D4505 | 2018 to 2024 |
| MCI D4520 | 2020 to 2026 |
| MCI D45CRT | 2024 to 2026 |
| MCI D45CRTLE | 2018 to 2025 |
| MCI J4500 | 2018 to 2026 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.