{"nhtsa_id":10085570,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-12-06","date":"2013-10-02","document_id":"TSB130140-100213","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"THIS TECHNICAL SERVICE BULLETIN ADDRESSES FAULT CODE 3911 IN CERTAIN ENGINES INSTALLED IN PETERBILT 320 CHASSIS. THE ROOT CAUSE IS RELATED TO THE VOLTAGE TO THE AMMONIUM HYDROXIDE NH3 SENSOR DIPPING BELOW THE 9 VOLT SPECIFICATION, CAUSING TIME OUT NH3 ERRORS. THE CORRECTIVE ACTION IS CONTAINED IN THE OEM DOCUMENTATION FOR THE FIELD FIX.","document":null,"url":"https://open.wenmarpro.com/bulletins/10085570","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"ISX12","year_from":null,"year_to":null,"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":[]}