{"nhtsa_id":10203783,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-03","date":"2021-11-09","document_id":"42-059","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION MOTOR:CONTROLLER; ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN; ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Non-Safety Campaign - Vehicles with a Cummins X15 engine and Horton fan drive may set Diagnostic Trouble Code (DTC) 6637 and/or 3838 due to fan speed that results in the fan remaining activated until the power is cycled. A new controller will resolve the issue.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203783-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203783-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203783","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null},{"id":"hybrid-ev","name":"Hybrid and electric drive","parent":null},{"id":"cooling-fan","name":"Cooling fan","parent":"engine"},{"id":"cooling-system","name":"Cooling system","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"PETERBILT","model":"567","year_from":2018,"year_to":2020,"match":"exact","vehicle_ids":["2018_peterbilt_567","2019_peterbilt_567","2020_peterbilt_567"]},{"make":"PETERBILT","model":"579","year_from":2018,"year_to":2020,"match":"exact","vehicle_ids":["2018_peterbilt_579","2019_peterbilt_579","2020_peterbilt_579"]}],"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":[]}