Overdrive light flashing- Limp mode

This is most likely a solenoid issue or greater internal transmission issue so we need to start with checking for codes. Here is a guide that will help with this:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Depending on the codes we can take specific action but here is a guide that will help with this issue of limp mode:

https://www.2carpros.com/articles/reduced-power-limp-mode

I am attaching the info about the solenoids as this is the most common issue but we need to start with checking for codes as that will most likely point us direction to the issue.

Let us know what you find with this and we can go from there. Thanks