Chevrolet Silverado 2004 — technical service bulletin
Bulletin 01678 · NHTSA communication 10007241 · issued Jan 1, 2004
Technical service bulletin
communication type
Fuel System, Gasoline
component
2004
model years
2
vehicle entries
Official summary
6.6 lly duramax diesel engines have an issue with the high pressure fuel lines that prevent them from achieving the proper torque upon reinstallation after a repair. *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.