RAM 2500 2025 — technical service bulletin
Bulletin S2525000002 · NHTSA communication 11018445 · issued May 16, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2025
model years
4
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.