RAM 2500 2025–2026 — technical service bulletin
Bulletin S2525000003 · NHTSA communication 11026557 · issued Dec 6, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2025–2026
model years
4
vehicle entries
Official summary
Diesel Exhaust Fluid (DEF) leaking around the gasket mount of the DEF doser causing an external, white, deposit build-up.
Vehicles covered
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.