{"nhtsa_id":10203983,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-12-07","date":"2021-11-12","document_id":"KC-4","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Diagnostic Trouble Code ( DTC ) P20BA, ( Related DTC P20E8 ) : Fault Code Reductant ( Diesel Exhaust Fluid - DEF ) Heater Control Performance Diagnosis","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203983-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10203983-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10203983","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P20BA","P20E8"],"topics":[],"vehicles":[{"make":"MACK","model":"MACK","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":[]}