{"nhtsa_id":10011666,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-01-28","date":null,"document_id":"3221C","mfr_campaign":null,"replaces":"3221D","component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"SERVICE ENGINE SOON LIGHT DUE TO A P0171 DIAGNOSTIC TROUBLE CODE. *EH 3221A NOT YET RECEIVED. *TT UPDATE. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10011666","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P0171"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"COLORADO","year_from":2004,"year_to":2006,"match":"exact","vehicle_ids":["2004_chevrolet_colorado","2005_chevrolet_colorado","2006_chevrolet_colorado"]},{"make":"GMC","model":"CANYON","year_from":2004,"year_to":2006,"match":"exact","vehicle_ids":["2004_gmc_canyon","2005_gmc_canyon","2006_gmc_canyon"]},{"make":"HUMMER","model":"H3","year_from":2006,"year_to":2006,"match":"exact","vehicle_ids":["2006_hummer_h3"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}