RAM 2500 2025 — technical service bulletin
Bulletin 21-027-25 · NHTSA communication 11016880 · issued Apr 2, 2025
Technical service bulletin
communication type
Power Train
component
2025
model years
1
vehicle entries
Official summary
" Flash: Transmission Control Module (TCM) Update Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): ● P1DCD-00 - TCM Monitoring Processor Performance Multiple Clutches Locked Up. Customers may also experience the following: ● Vehicle enters into limp home mode. This bulletin involves inspecting the TCM software level and possibly reprogramming the TCM with the latest available software."
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.