{"nhtsa_id":10153610,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-02-25","date":"2018-12-03","document_id":"11-186-18","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"summary":"This bulletin announces availability of reprogramming files to optimize the ECM. These files enhance detection of DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED. If a customer presents with a rough idle concern and / or hesitation after a cold start when using winter-blend fuels, reprogram the ECM following the normal FlashWrite procedure. The new logic contains revised A/F, ignition timing and alternator controls designed to prevent an over-lean fuel mixture condition at cold start and stabilize the engine idle.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10153610-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2018/MC-10153610-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10153610","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P0300"],"topics":[],"vehicles":[{"make":"SUBARU","model":"IMPREZA","year_from":2014,"year_to":2014,"match":"exact","vehicle_ids":["2014_subaru_impreza"]}],"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":[]}