Wrench Light keeps coming on putting my 2015 2.7 L into a limp mode. It's only when we're going up a steep hill or hauling something. It's very inconsistent. Sometimes it will do it and other times it won't. I had work done on it last year, and after the Ford shop did that it started throwing that wrench. IWE's & front and rear diff were replaced. I believe a few other things as well but can't recall what it was, will have to look back on my records. Anyone else have this issue?

 

Can you stop someplace and have the vehicle computer checked for any codes ? Places like Autozone will do this for usually no charge.