Chevrolet Silverado 2004–2005 — technical service bulletin
Bulletin 3346 · NHTSA communication 10014804 · issued May 10, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2005
model years
4
vehicle entries
Official summary
There has been a high percentage of no trouble found (ntf) 6.6 lly engine control modules (ecms) being returned to the warranty parts center. The no trouble found (ntf) ecms are being replaced for a specific list of diagnostic trouble codes. *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.