Chevrolet Colorado 2004–2006 — technical service bulletin
Bulletin 3221C · NHTSA communication 10011666 · issued Jan 28, 2005
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2006
model years
7
vehicle entries
Official summary
Service engine soon light due to a p0171 diagnostic trouble code. *eh 3221a not yet received. *tt update. *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.