Overdrive Light Flashes

Hello, I'm Danny.

Here is the information you requested. It could be something simple and not necessarily mean a complete transmission rebuild. I would perform a CAN- Controller Area Network scan to check all the systems on your car. This scan includes any transmission codes that might be present. Here is a tutorial showing what is involved on performing a CAN scan:

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

After performing this get back to us with any codes that may have been stored like transmission codes and we can then help properly diagnose. Hope this helps and thanks for using 2CarPros.