Chevrolet Silverado 2003 — technical service bulletin
Bulletin 030604037 · NHTSA communication 10012563 · issued Aug 1, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003
model years
2
vehicle entries
Official summary
Service engine soon light on with diagnostic trouble code p0446 set replace canister. *eh
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.