RAM 2500 2013–2024 — technical service bulletin
Bulletin S1625000002 REV.B · NHTSA communication 11015599 · issued Mar 10, 2025
Technical service bulletin
communication type
Unknown / Other
component
2013–2024
model years
48
vehicle entries
Official 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
Vehicles covered
- 2013 RAM 2500
- 2014 RAM 2500
- 2015 RAM 2500
- 2016 RAM 2500
- 2017 RAM 2500
- 2018 RAM 2500
- 2019 RAM 2500
- 2020 RAM 2500
- 2021 RAM 2500
- 2022 RAM 2500
- 2023 RAM 2500
- 2024 RAM 2500
- 2013 RAM 3500
- 2014 RAM 3500
- 2015 RAM 3500
- 2016 RAM 3500
- 2017 RAM 3500
- 2018 RAM 3500
- 2019 RAM 3500
- 2020 RAM 3500
- 2021 RAM 3500
- 2022 RAM 3500
- 2023 RAM 3500
- 2024 RAM 3500
- 2013 RAM 4500
- 2014 RAM 4500
- 2015 RAM 4500
- 2016 RAM 4500
- 2017 RAM 4500
- 2018 RAM 4500
- 2019 RAM 4500
- 2020 RAM 4500
- 2021 RAM 4500
- 2022 RAM 4500
- 2023 RAM 4500
- 2024 RAM 4500
- 2013 RAM 5500
- 2014 RAM 5500
- 2015 RAM 5500
- 2016 RAM 5500
- 2017 RAM 5500
- 2018 RAM 5500
- 2019 RAM 5500
- 2020 RAM 5500
- 2021 RAM 5500
- 2022 RAM 5500
- 2023 RAM 5500
- 2024 RAM 5500
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.