{"nhtsa_id":10172437,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-03-16","date":"2020-02-11","document_id":"ATC2278A","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, DIESEL: PRE-HEATER; ELECTRICAL SYSTEM:WIRING","mfr_system":null,"summary":"This Account Team Coverage field action authorizes certified repair locations to change the fuel heater wiring harness polarity by switching wiring terminal locations within the fuel heater connector, to install a new fuel heater, and to replace or install a new fuse in the fuel heater circuit on certain B6.7 CM2350 B121B units. This field action is a commercial (non-safety) action to properly re-enable the fuel heater functionality that was removed to correct a recall condition as described in the recall report for NHTSA recall 19E-020. This is an update to a previously submitted communication.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10172437-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10172437-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10172437","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"fuel-system","name":"Fuel system","parent":null},{"id":"wiring","name":"Wiring and fuses","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"B6.7","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":[]}