Chrysler 300 2018–2021 — technical service bulletin
Bulletin 08-102-21 REV. A · NHTSA communication 10204379 · issued Nov 6, 2021
Technical service bulletin
communication type
Unknown OR Other
component
2018–2021
model years
12
vehicle entries
Official summary
UAS and UCS Radio Enhancements This bulletin involves inspecting and if required, updating the radio software level to 39.5 Customers may experience one or more of the following: Performance control home screen shows "Norm" mode for engine/transmission even when the vehicle is in "Drag" mode. High pitch squeal, pop or hum from all speakers. SXM favorite, displays empty song list. Intermittent, black radio display screen. Intermittent, radio freezes. Bluetooth® pairing and/or connection issues. Lost radio presets. Radio channels change by itself. SXM icon inoperative.
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.