{"nhtsa_id":10006859,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-05-18","date":"2004-05-01","document_id":"04031","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"INSUFFICIENT GROUND TO THE OIL PRESSURE SWITCH, PREVENTING THE ENGINE OIL PRESSURE WARNING LIGHT FROM ILLUMINATING WHEN THE VEHICLE IS STARTED AND WHEN THE ENGINE OIL PRESSURE FALLS BELOW NORMAL. ALSO INCLUDES GMC AND CHEVROLET W3500/3500 SERIES ISUZU AND NPR/HD 2004. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10006859","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"W3500","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"W4500","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"W3500","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"W4500","year_from":2003,"year_to":2003,"match":null,"vehicle_ids":[]},{"make":"ISUZU","model":"NPR","year_from":2003,"year_to":2003,"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":[]}