Chevrolet Silverado 2001–2004 — technical service bulletin
Bulletin 100803 · NHTSA communication 10004983 · issued Oct 8, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2004
model years
8
vehicle entries
Official summary
Excessive duramax turbocharger whine noise or possibly a performance or a fuel economy complaint. Gm voicemail log. This includes 2003-2004 4500 and 5500 trucks. *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.