Overdrive light is flashing?

Hello, I'm Danny.

It sounds that you might have fault codes stored in the transmission system. The best thing for you to do is have a CAN scan- Controller Area Network performed to determine what fault codes are stored in your vehicles computer. Here is a tutorial showing what is involved with a CAN scan:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Once you have this performed get back to us with the code numbers and we can then properly diagnose the issues your vehicle is having. Hope this helps and thanks for using 2CarPros. We hope you will use our site again in the future when needed.