Buick Rainier 2004 — technical service bulletin
Bulletin 3329 · NHTSA communication 10017201 · issued Oct 28, 2005
Technical service bulletin
communication type
Vehicle Speed Control
component
2004
model years
4
vehicle entries
Official summary
Surge, chuggle or buck while driving downhill (approximately 1500 - 3000 feet above sea level) at highway speeds with the cruise control on. *tt
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.