Chevrolet Avalanche 2002–2003 — technical service bulletin
Bulletin 020421006A · NHTSA communication 10000173 · issued Oct 1, 2002
Technical service bulletin
communication type
Power Train
component
2002–2003
model years
12
vehicle entries
Official summary
Inoperative 4wd/awd lamps, inoperative 4wd/awd system. *tt
Vehicles covered
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.