{"vehicle":{"id":"2017_peterbilt_520","year":2017,"make":"Peterbilt","model":"520"},"code":"P1644","generic":false,"description":null,"bulletins":{"as_of":"2026-10-19","count":1,"bulletins":[{"nhtsa_id":10159673,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-05-13","date":"2019-04-04","document_id":"34-074","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"Non Safety Campaign: Vehicles were built with a 5 bolt supply wire for the air dryer pressure sensor that is no longer required with current architecture. If left in place, a fault code P1644 may be set.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10159673-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10159673-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10159673"}],"url":"https://open.wenmarpro.com/makes/peterbilt/520/2017/bulletins?code=P1644"},"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/peterbilt/520/2017/codes/P1644","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."]}