Jeep Grand Wagoneer 2024–2025 — technical service bulletin
Bulletin 21-016-25 · NHTSA communication 11014387 · issued Feb 14, 2025
Technical service bulletin
communication type
Power Train
component
2024–2025
model years
4
vehicle entries
Official summary
"Valve Body Replacement Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● U0101 - Lost Communication With The Transmission Control Module (TCM). ● U0402 - Implausible Data Received From TCM. ● U0418 - Implausible Data Received From Brake System Control Module 1. Customers may also comment on the following: ● Vehicle will go in limp-in mode. After limp-in mode, once in park the vehicle will not shift in gear. This bulletin involves replacing the Transmission Valve Body."
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.