RAM 1500 2025 — technical service bulletin
Bulletin 21-011-25 REV. B · NHTSA communication 11026798 · issued Dec 20, 2025
Technical service bulletin
communication type
Power Train
component
2025
model years
1
vehicle entries
Official summary
Flash: Transmission Control Module (TCM) Updates *Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P1B14-00 - Park By Wire Unintended Park Position. ● P1DF3-00 - ECU Not Initialized.** The customer may describe one or more of the following: ● **Secure idle feature not working with Powerpanel On. ● When shifting from Drive to Reverse and vice versa, the transmission detects a mismatch in Neutral as the gear shifter goes from Drive to Reverse through Neutral (D-N-R or R-N-D)
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.