Chevrolet Silverado 2001–2004 — technical service bulletin
Bulletin 01512 · NHTSA communication 10005462 · issued Jan 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2004
model years
10
vehicle entries
Official summary
6.6 liter duramax diesel engine fuel knock noise. Various models including the 2004 gmc c4500 and c5500. Sit bulletin 1406247. *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.