{"nhtsa_id":10013205,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-04-12","date":"2004-04-29","document_id":"04292004","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"ENGINE MAY HAVE A CONDITION IN WHICH THE EXHAUST VALVE STEM MAY BECOME DEFORMED. THIS INCLUDES 1999-01 CHEVROLET AND GMC 4500 AND 5500 MODELS. *EH","document":null,"url":"https://open.wenmarpro.com/bulletins/10013205","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"GMC","model":"SIERRA 3500","year_from":1999,"year_to":2001,"match":"base","vehicle_ids":["1999_gmc_sierra","2000_gmc_sierra","2001_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":[]}