{"nhtsa_id":10043093,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2012-02-21","date":"2011-09-01","document_id":"PI-0760","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:DIESEL","mfr_system":null,"summary":"MACK TRUCK: ON CERTAIN VEHICLES, THE AFTERTREATMENT DIESEL EXHAUST FLUID (DEF) SOLENOID VALVE WAS INCORRECTLY MOUNTED BACKWARDS. THIS CAUSES COOLANT TO LIFT VALVE SEAT AND FLOW CONTINUOUSLY, OVERHEATING AND POSSIBLY ILLUMINATING INDICATOR MALFUNCTIONING LIGHT. MODEL GU. *PE","document":null,"url":"https://open.wenmarpro.com/bulletins/10043093","components":[{"id":"engine","name":"Engine","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"GU","year_from":2010,"year_to":2011,"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":[]}