Chevrolet Silverado 2002–2003 — technical service bulletin
Bulletin 030604065 · NHTSA communication 10005184 · issued Dec 1, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2002–2003
model years
4
vehicle entries
Official summary
Lack of passenger compartment heat and/or raised/rough idle after start and/or p0128 diagnostic trouble code (dtc) stored with no service engine soon light illuminated. *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.