Jeep Grand Cherokee 2018–2020 — technical service bulletin
Bulletin 0809421 · NHTSA communication 10223369 · issued May 25, 2021
Technical service bulletin
communication type
Equipment
component
2018–2020
model years
5
vehicle entries
Official summary
UKA and UKG Radio Enhancements This bulletin involves updating the radio software level to 1848.35. Customers may experience one or more of the following:Radio display screen flickers. Clock loses 6 seconds per day (2019 JL with UKA). Radio resets with RPM less than 1000 RPM (2020 JL with UKG and 3.0L Diesel - EXJ).
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.