RAM 2500 2025–2026 — technical service bulletin
Bulletin S2525000002 REV.B · NHTSA communication 11031236 · issued Mar 31, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2025–2026
model years
8
vehicle entries
Official summary
Diesel Exhaust Fluid (DEF) Gauge Fluctuates Or Is Erratic. Diagnostic Trouble Code (DTC) P203F – Reductant Level Too Low.
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.