Hello. It sounds like it could be the charging system is having an intermittent problem. This can be an engine computer (ECM) starting to fail (the ECM is what controls the Alternator is modern vehicles). It can be a failing Alternator itself, a failing battery, or even possibly a bad Ground connection to the engine computer. The reason you lost power steering is because the engine shut down. What size engine is in the vehicle, 2.4l, 3.5l, 3.6l or 3.9l? I will pull up some wiring diagrams for the charging system and engine computer. As well as look up for any Technical Service Bulletins. And what Sub-Model is it, a GT, Base, etc?
Below are listed some Technical Service Bulletins regarding the Charging/Alternator system for this vehicle. And unfortunately, there are quite a few more as well concerning electrical connections and corrosion.
Images (Click to enlarge)
Friday, May 13th, 2022 AT 3:57 PM