{"nhtsa_id":10168701,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-12-04","date":"2019-11-07","document_id":"26-032","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING; POWER TRAIN","mfr_system":null,"summary":"Non-Safety Campaign: Certain chassis built between March 01, 2017 and August 26, 2019 that are equipped with MX-11/MX-13 EPA2017 engines, and with Eaton UltraShift or Fuller transmissions may experience an engine overspeed error when going downhill. New shift calibrations have improved protective upshift logic to allow upshift sooner when approaching overspeed conditions. Resolution is to update the transmission software and shift calibration software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10168701-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10168701-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10168701","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"PETERBILT","model":"PETERBILT","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"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":[]}