{"vehicle":{"id":"1996_buick_roadmaster","year":1996,"make":"Buick","model":"Roadmaster"},"code":"P0400","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":1,"bulletins":[{"nhtsa_id":616774,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-03-09","date":"2001-01-01","document_id":"00096","mfr_campaign":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)","summary":"SOME CUSTOMERS MAY EXPERIENCE A FAILURE OF THE EXHAUST GAS RECIRCULATION (EGR) VALVE DUE TO CORROSION OF THE INTERNAL DIAPHRAGM PLATE, LEADING TO DRIVEABILITY COMPLAINTS OF A CHECK ENGINE LIGHT FOR EGR VALVE (DTC P0400); OR ENGINE STALL AT IDLE, RUNS ROUGH OR SURGES. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/616774"}],"url":"https://open.wenmarpro.com/makes/buick/roadmaster/1996/bulletins?code=P0400"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/buick/roadmaster/1996/codes/P0400","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}