Chevrolet Sierra 2001 — technical service bulletin
Bulletin 140801 · NHTSA communication 625280 · issued Aug 14, 2001
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001
model years
7
vehicle entries
Official summary
Subject pertaining to detonation, hesitation, or sag on vehicles equipped with the six liter v-8 engine. *jg
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.