Flashing overdrive light, transmission will not shift into second gear?

Hi,

Are you able to turn the OD off to see if it shifts properly? Have you checked the transmission fluid and condition?

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

If the fluid is good, then we really should scan the computer for diagnostic trouble codes.

Here is a link that shows how to scan all modules:

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

If you are unable to do the scan, most parts stores will do a basic scan at no charge. It may point us in the right direction. I'm suggesting a scan because there are a few different things that can be causing this. Without a scan, it becomes a guessing game that can be expensive. I hope you understand.

Let me know your thoughts or questions.

Take care,

joe