Jeep Grand Wagoneer 2022 — technical service bulletin
Bulletin 21-017-25 · NHTSA communication 11015540 · issued Mar 4, 2025
Technical service bulletin
communication type
Power Train
component
2022
model years
2
vehicle entries
Official summary
"Flash: Transmission Control(TCM) Module Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P0300 - Multiple Cylinder Misfire. NOTE: DTC P0300 will be set in the Powertrain Control Module (PCM). No DTCs will be stored in the TCM. Customers may also experience the following: ● Rough running engine. 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.