{"nhtsa_id":10056212,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2014-10-06","date":"2014-07-01","document_id":"ER-14231","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"IMPCO: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SOME VEHICLES WITH COMPRESSED NATURAL GAS (CNG) SYSTEM WERE BUILT INCORRECTLY WITH THE ENGINE CONTROL MODULE (ECM) CALIBRATION AND WOULD NEED TO HAVE ECM REPROGRAMMED. MODEL 2015 SILVERADO HD, SIERRA HD. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10056212","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO HD","year_from":2015,"year_to":2015,"match":"base","vehicle_ids":["2015_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA HD","year_from":2015,"year_to":2015,"match":"base","vehicle_ids":["2015_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":[]}