It does not connect the Over Drive

Hello. I have an Hyundai Accent Prime 2003. And it does not connect the Overdrive.

Hello greetings there are several causes that can work this symptoms, you have to check fault codes to start checking oil level, possible causes any sensor that comes into conflict or lack of some sensor signal to be able to apply OD, converter, solenoid, valve valve of valve body and some documented cases connector or switch of OD or wiring, in some cases.