RAM 1500 2025 — technical service bulletin
Bulletin 21-015-25 REV.A · NHTSA communication 11021049 · issued Jul 19, 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 - Park By Wire Unintended Park Position. ● P1DF3 - ECU Not Initialized.** The customer must describe one or more of the following: ● **Secure Idle feature not working with Powerpanel on. ● When the driver tries to shift from Drive to Reverse and vice versa, transmission detects a mismatch in Neutral as the gear shifter goes from Drive to Reverse through Neutral (D-N-R o
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.