Chevrolet Avalanche 1999–2002 — technical service bulletin
Bulletin 020421004 · NHTSA communication 634899 · issued Apr 1, 2002
Technical service bulletin
communication type
Power Train
component
1999–2002
model years
24
vehicle entries
Official summary
Some customers may comment on the service 4wd indicator illuminating with diagnostic trouble code b2725 set. *tt
Vehicles covered
- 1999 Chevrolet Avalanche
- 2000 Chevrolet Avalanche
- 2001 Chevrolet Avalanche
- 2002 Chevrolet Avalanche
- 1999 Chevrolet Silverado
- 2000 Chevrolet Silverado
- 2001 Chevrolet Silverado
- 2002 Chevrolet Silverado
- 1999 Chevrolet Suburban
- 2000 Chevrolet Suburban
- 2001 Chevrolet Suburban
- 2002 Chevrolet Suburban
- 1999 Chevrolet Tahoe
- 2000 Chevrolet Tahoe
- 2001 Chevrolet Tahoe
- 2002 Chevrolet Tahoe
- 1999 GMC Sierra
- 2000 GMC Sierra
- 2001 GMC Sierra
- 2002 GMC Sierra
- 1999 GMC Yukon
- 2000 GMC Yukon
- 2001 GMC Yukon
- 2002 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.