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Beware speed sensors seldom fail. Chrysler products transmission have a limp mode where they only shift to second gear when something goes wrong and many times when nothing is wrong. If the speedometer fails it goes to limp. If an OBD scan gives a transmission code sometimes clearing the code will end the problem. When driving if the transmission shifts one time as it should the sensor is working.
In the OB=2 codes system p0715 refers to the turbine shaft speed (TSS) sensor --circuit malfunction===causes --wiring --TSS--ECM/TCM (TCM is the transmission control module). It all refers to the turbine shaft in the torque converter
P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.