Chevrolet Trailblazer 2004 — technical service bulletin
Bulletin 040419001 · NHTSA communication 10012696 · issued Feb 1, 2004
Technical service bulletin
communication type
Power Train
component
2004
model years
5
vehicle entries
Official summary
Diagnostic trouble code (dtc) c0379 set, service 4wd light on, 4wd inoperative. *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.