{"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,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"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","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P1644"],"topics":[],"vehicles":[{"make":"PETERBILT","model":"520","year_from":2017,"year_to":2020,"match":"exact","vehicle_ids":["2017_peterbilt_520","2018_peterbilt_520","2019_peterbilt_520","2020_peterbilt_520"]}],"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":[]}