{"nhtsa_id":10014804,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-05-10","date":null,"document_id":"3346","mfr_campaign":null,"replaces":"3346A","component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"THERE HAS BEEN A HIGH PERCENTAGE OF NO TROUBLE FOUND (NTF) 6.6 LLY ENGINE CONTROL MODULES (ECMS) BEING RETURNED TO THE WARRANTY PARTS CENTER. THE NO TROUBLE FOUND (NTF) ECMS ARE BEING REPLACED FOR A SPECIFIC LIST OF DIAGNOSTIC TROUBLE CODES. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10014804","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO","year_from":2004,"year_to":2005,"match":"exact","vehicle_ids":["2004_chevrolet_silverado","2005_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA","year_from":2004,"year_to":2005,"match":"exact","vehicle_ids":["2004_gmc_sierra","2005_gmc_sierra"]}],"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":[]}