Chevrolet Sierra 2001 — technical service bulletin
Bulletin 210801 · NHTSA communication 625136 · issued Aug 21, 2001
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001
model years
4
vehicle entries
Official summary
Subject regarding a one-two shift shutter which may occur on light throttle acceleration. *jg
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.