{"nhtsa_id":10246226,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-12-05","date":"2023-11-03","document_id":"CB23-L-001","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, DIESEL:STORAGE:TANK ASSEMBLY","mfr_system":null,"summary":"IN SOME 2021MY ISUZU F-SERIES VEHICLES, OPERATORS MAY EXPERIENCE AN ILLUMINATED CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL) WITH DIAGNOSTIC TROUBLE CODE (DTC) P2201 NOX SENSOR CIRCUIT PERFORMANCE SENSOR 1 AND/OR DTC P20EE DIESEL EXHAUST FLUID (DEF) SYSTEM NOX TRAP LOW EFFICIENCY SET IN THE DEF CONTROL UNIT (DCU). WE HAVE DETERMINED A DCU CALIBRATION ERROR IS CAUSING THIS DTC TO SET. THEREFORE, THIS DTC MAY BE RESOLVED BY REPROGRAMMING THE DCU WITH A REVISED CALIBRATION.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10246226-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10246226-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10246226","components":[{"id":"fuel-system","name":"Fuel system","parent":null},{"id":"fuel-tank","name":"Fuel tank","parent":"fuel-system"}],"codes":["P20EE","P2201"],"topics":[],"vehicles":[{"make":"ISUZU","model":"F-SERIES","year_from":2021,"year_to":2021,"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":[]}