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Service bulletin 3078

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 id10009621
Published by NHTSA2004-10-13
Manufacturer's number3078
Replaces3078B
NHTSA componentSUSPENSION:FRONT:WHEEL BEARING

NHTSA's summary

GREASE LEAK FROM FRONT HUB BEARING. *TT UPDATE. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Suspension, Wheel bearing

Vehicles listed
CHEVROLET SILVERADO2004, 2005
GMC SIERRA2004, 2005
HUMMER H22004, 2005

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

Other bulletins for the same vehicles and component
PIT3078F2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have grease leaking from front hub bearings. Technician should not replace the bearing for grease purge. Technician should be advised to not clean the purged grease from the area immediately on or adjacent to the seals because this grease provides additional protection. Technician should only replace the bearing if the seals show visible damage, bearing endplay is greater than 0.005" or 0.13mm, bearing exhibits rough rotation, or bearing exhibits abnormal noise.
0806032003-11-05. Service bulletin. DIFFICULTY WHEN INSTALLING WHEEL CENTER CAPS TO 17-INCH ALUMINUM WHEELS. VME MESSAGE. *TT