Engine management mode?

There are many things that can cause this. The first step would be to use a scan tool to see what is stored in reference to it going into limp mode. You will want a higher-level tool than a basic code reader to see which modules are storing errors and data.

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

Once you have that information you can determine what steps are needed to repair it.