Buick Rainier 2002–2004 — technical service bulletin
Bulletin 01843 · NHTSA communication 10007961 · issued Jan 1, 2004
Technical service bulletin
communication type
Power Train
component
2002–2004
model years
10
vehicle entries
Official summary
Calibration for improved transfer case operation in awd mode. *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.