{"nhtsa_id":617721,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-03-24","date":"2000-11-01","document_id":"000604047","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:GASOLINE","mfr_system":null,"summary":"SOME MEDIUM DUTY MODELS WITH 3126 CATERPILLAR DIESEL ENGINE AND ALLISON AUTOMATIC TRANSMISSION MAY EXHIBIT AN ENGINE SPEED POWER TAKEOFF (PTO) OPERATION RETURNING TO IDLE FOR NO APPARENT REASON. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/617721","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"C6500","year_from":1998,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"C7500","year_from":1998,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C6500","year_from":1998,"year_to":2001,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"C7500","year_from":1998,"year_to":2001,"match":null,"vehicle_ids":[]}],"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":[]}