Jeep Grand Cherokee 2021–2023 — technical service bulletin
Bulletin S2203000004 Rev. · NHTSA communication 10229770 · issued Dec 22, 2022
Technical service bulletin
communication type
Electrical System
component
2021–2023
model years
3
vehicle entries
Official summary
Service 4wd Light/Message Illuminated. Diagnostic Trouble Codes (DTCs) C149D-54 ? Clutch Calibration Not Learned ? Missing Calibrations, And/Or C149D-55 ? Clutch Calibration Not Learned ? Not Configured, Set After Drivetrain Control Module (DTCM) Reprogramming.
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.