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Your transmission has gone into what is called "limp in mode"
because the TCM has detected a problem.
The TCM continuously monitors system performance. When a problem is detected in the electrical control or hydraulic portion of the system, the TCM stores a Diagnostic Trouble Code (DTC). Most DTCs cause the transaxle to enter limp-in or default mode.
The DTCs need to be accessed with the Chrysler DRB-II scan tool. A generic scan tool may not be able to access the DTCs. I think the diagnostic time to find out the DTCs will be worth the money. Most often a transmission goes into limp-in mode due to an electrical problem.