Chevrolet Avalanche 2001–2004 — technical service bulletin

Bulletin 01586 · NHTSA communication 10007668 · issued Jan 1, 2004

Technical service bulletin

communication type

Engine and Engine Cooling

component

2001–2004

model years

vehicle entries

Official summary

8.1l changes in heads, bolts and gasket for for 2004 1/2 engines. Various models including the chevrolet and gmc 2500hd/3500 my2001-2004 and 2001, 2002, and 2003 gmt 560. *mj

Vehicles covered

2002 Chevrolet Avalanche
2003 Chevrolet Avalanche
2004 Chevrolet Avalanche
2001 Chevrolet Suburban
2002 Chevrolet Suburban
2003 Chevrolet Suburban
2004 Chevrolet Suburban
2001 GMC Sierra
2002 GMC Sierra
2003 GMC Sierra
2004 GMC Sierra
2001 GMC Yukon
2002 GMC Yukon
2003 GMC Yukon
2004 GMC Yukon

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.