Chrysler 300 2021 — technical service bulletin
Bulletin 2101123 · NHTSA communication 10236953 · issued Apr 25, 2023
Technical service bulletin
communication type
Power Train
component
2021
model years
1
vehicle entries
Official summary
Flash: Transmission Control Module (TCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set. ? P0729-00 - Gear 6 Shift Incorrect Ratio. Other software enhancement: ? Improved vehicle downshift and coast down performance. This bulletin involves 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.