Chevrolet Silverado 2004–2005 — technical service bulletin
Bulletin 3394C · NHTSA communication 10017025 · issued Oct 21, 2005
Technical service bulletin
communication type
Fuel System, Diesel
component
2004–2005
model years
4
vehicle entries
Official summary
Duramax diesel injector driver codes. Misfire, rough running, and the malfunction indicator lamp (mil) / service engine soon (ses) light on. *tt
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.