Chevrolet C4500 2004–2006 — technical service bulletin
Bulletin 3491 · NHTSA communication 10017016 · issued Oct 21, 2005
Technical service bulletin
communication type
Fuel System, Other
component
2004–2006
model years
20
vehicle entries
Official summary
Highway speed excessive smoke and fuel knock. *tt
Vehicles covered
- 2006 Chevrolet C4500
- 2006 Chevrolet C5500
- 2004 Chevrolet Express
- 2005 Chevrolet Express
- 2006 Chevrolet Express
- 2004 Chevrolet Kodiak
- 2005 Chevrolet Kodiak
- 2004 Chevrolet Silverado
- 2005 Chevrolet Silverado
- 2006 Chevrolet Silverado
- 2006 GMC C4500
- 2006 GMC C5500
- 2004 GMC Savana
- 2005 GMC Savana
- 2006 GMC Savana
- 2004 GMC Sierra
- 2005 GMC Sierra
- 2006 GMC Sierra
- 2004 GMC Topkick
- 2005 GMC Topkick
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.