Service bulletin TT7687EN
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 | 10155504 |
| Published by NHTSA | 2019-04-01 |
| Manufacturer's number | TT7687EN |
| Manufacturer's date | 2015-07-20 |
| NHTSA component | ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:SOFTWARE |
NHTSA's summary
Tech Tip concerning TCM DTC that can occur under high loads; customers should be directed to Mack/Volvo to upgrade engine software
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, Engine, Software
| ALLISON 3000 SERIES TRANSMISSION | |
|---|---|
| ALLISON 4000 SERIES TRANSMISSION |
Listing a model year does not mean every vehicle of it is concerned: the document says which.