Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Ok good. The p0720 is output speed sensor error. This is what I would have expected to see with the symptoms you are having. Your problem still either lies with the sensor, the wiring to the sensor, or the engine/trans control module. You might try another sensor, the new one may have been bad. Its not unheard of. If that doesn't do it, the next step would be some wiring diagnostics with an ohm meter. If the sensor is ok and the wiring checks out, then you could condemn the trans controller.
The transmission is fully electronically controlled. It has the input and output speed sensors, a range sensor, and the solenoid pack mounted to the front that controls shifting. All of the sensors are monitored by a module, and the module controls all shifting through the solenoids. The car does not have a standalone trans controller anymore. The engine controller and trans controller are now 2 seperate modules that are located inside the same module. This is called an NGC powertrain control module. Its located on the lower core support just forward of the airbox. Its a silver box with 4 electrical connectors.