Chevrolet Express 2003–2004 — technical service bulletin
Bulletin 040604028 · NHTSA communication 10012598 · issued Apr 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003–2004
model years
4
vehicle entries
Official summary
Various driveability concerns check engine light on diagnostic trouble code set. *eh
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.