Service bulletin WSB-09
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 | 11029256 |
| Published by NHTSA | 2026-03-03 |
| Manufacturer's number | WSB-09 |
| Manufacturer's date | 2026-02-20 |
| Campaign id or software version | WSB-09 |
| NHTSA component | ELECTRICAL SYSTEM |
NHTSA's summary
Tiffin Motorhomes issued a technical service bulletin for Open Trail Motorhomes with a 51V battery system and a hydronic heating system. It was found that operating the hydronic heating system on the diesel burner would cause a temporary overload of the electrical system which would shut down. To solve this issue, 2 new DC-DC converters are being installed.
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
Electrical system
| TIFFIN OPEN TRAIL | 2025 to 2026 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.