GMC Sierra 2001–2002 — technical service bulletin
Bulletin 040604019 · NHTSA communication 10012582 · issued Apr 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2002
model years
2
vehicle entries
Official summary
Revised diagnostic system check - engine controls. Also to include 2001/2002 chevrolet 3500 hd. *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.