{"vehicle":{"id":"2021_ram_5500","year":2021,"make":"Ram","model":"5500"},"code":"U11C1","generic":false,"description":null,"bulletins":{"as_of":"2026-10-19","count":3,"bulletins":[{"nhtsa_id":11016060,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-03-28","date":"2025-03-28","document_id":"9100508","mfr_campaign":null,"component":"UNKNOWN OR OTHER","summary":"\"6 CONTROL UNIT, Diesel Exhaust Customer complaints with malfunction light illuminated on 2019 thru 2024 MY DJ / D2 / DD / DP vehicles with 6.7L (ETL / ETM / ETN) built on or before October 15,2024 and exhibiting DTCs P21C4-00 (Reductant Line Heater Relay Control Circuit High) and / or U11C1-00 (Reductant Control Module received implausible Data from ECM / PCM). These DTCs will occur after installation of service DCU 68458603AB. Do not replace parts until after the TSB 25-008-24 is performed. If the DTC(s) continue to set, then follow the Service Diagnostics for the applicable DTC.\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11016060-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11016060-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11016060"},{"nhtsa_id":11015599,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-03-13","date":"2025-03-10","document_id":"S1625000002 REV.B","mfr_campaign":null,"component":"UNKNOWN OR OTHER","summary":"Malfunction Indicator Lamp (MIL) Illumination, Diagnostic Trouble Codes (DTCs) P21C4 – (Diesel Exhaust Fluid) Reductant Line Heater Control Circuit High, and U11C1 – Reductant Control Module Received Implausible Data From ECM/PCM, Set","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015599-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015599-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11015599"},{"nhtsa_id":11010636,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2024-11-18","date":"2024-11-14","document_id":"25-008-24","mfr_campaign":null,"component":"UNKNOWN OR OTHER","summary":"\"Flash: Diesel Exhaust Fluid (DEF) Dosing Control Unit (DCU) Update Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P21C4-00 - Reductant Line Heater Relay Control Circuit High. ● U11C1-00 - Reductant Control Module Received Implausible Data From ECM/PCM. These DTCs will occur after installation of service DCU 68458603AB. This bulletin involves reprogramming the DCU with the latest available software.\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-11010636-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2024/MC-11010636-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11010636"}],"url":"https://open.wenmarpro.com/makes/ram/5500/2021/bulletins?code=U11C1"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/ram/5500/2021/codes/U11C1","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}