Buick Century 2003 — technical service bulletin
Bulletin 020730039 · NHTSA communication 10000184 · issued Oct 1, 2002
Technical service bulletin
communication type
Power Train
component
2003
model years
14
vehicle entries
Official summary
Firm transmission shifts, shudder / chuggle, transmission won't downshift on deceleration, service engine soon light illuminated, diagnostic trouble code (dtc) p0742 set. *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.