Chevrolet B7 2001–2002 — technical service bulletin
Bulletin 020604005 · NHTSA communication 629495 · issued Feb 1, 2002
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2002
model years
21
vehicle entries
Official summary
Subject regarding revised diagnostic trouble code p1221 service manual information. *tt
Vehicles covered
- 2001 Chevrolet B7
- 2002 Chevrolet B7
- 2001 Chevrolet Corvette
- 2002 Chevrolet Corvette
- 2001 Chevrolet C Series
- 2002 Chevrolet C Series
- 2001 Chevrolet Express
- 2001 Chevrolet Silverado
- 2001 Chevrolet Silverado 3500
- 2002 Chevrolet Silverado 3500
- 2001 Chevrolet Suburban
- 2001 Chevrolet Tahoe
- 2001 GMC B7
- 2002 GMC B7
- 2001 GMC C Series
- 2002 GMC C Series
- 2001 GMC Savana
- 2001 GMC Sierra
- 2001 GMC Sierra 3500
- 2002 GMC Sierra 3500
- 2001 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.