There was one technical service bulletin issued for the 2004 Hummer H1.
| Bulletin Date: | Jun. 1, 2008 |
| Component: | Front suspension hub. |
| Bulletin Summary: | Halfshaft retaining bolt with pre-applied thread locker for all h1 models and model years. |
| Vehicles covered in this TSB: |
2003 Hummer H1,
2004 Hummer H1,
2005 Hummer H1,
2006 Hummer H1.
|