Jeep Grand Cherokee 2021 — technical service bulletin
Bulletin 08-105-25 REV. A · NHTSA communication 11018465 · issued May 13, 2025
Technical service bulletin
communication type
Electrical System
component
2021
model years
3
vehicle entries
Official summary
"Flash: Trailer Tow Module (TTM) Updates Customers may comment on one or more of the following: ● If the vehicle is traveling at less than 5 kph (3 mph) and the brake pedal is pressed, then both turn lights will flash for two milliseconds. ● If the vehicle is traveling at less than 5 kph (3 mph) and one turn light is activated, then the opposite turn light will flash for 20 milliseconds. NOTE: This issue only effects the trailer lighting This bulletin involves updating the TTM with the latest available software."
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.