Dodge Challenger 2018 — technical service bulletin
Bulletin 21-046-19 · NHTSA communication 10170416 · issued Dec 21, 2019
Technical service bulletin
communication type
Power Train
component
2018
model years
2
vehicle entries
Official summary
Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. The following software update is available: Improvements to 2-1 downshift quality.
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.