RAM 2500 2025 — technical service bulletin
Bulletin 21-028-26 · NHTSA communication 11031329 · issued Apr 8, 2026
Technical service bulletin
communication type
Power Train
component
2025
model years
2
vehicle entries
Official summary
Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ? P0826-00 - Up/Down Shift Sw
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.