will not shift past 2nd gear?

More than likely this is a speed sensor issue.

So, let's start with testing a speed sensor using this guide. This guide is for a wheel speed sensor, but the process is the same.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Please run through this and use the info below from the manual to do this testing and replace it if needed.

Let me know if you have questions. Thanks