Yes, I do have a scanner that runs off an app, but it doesn't show much, or anything, when it comes to things like wheel speeds, etc. It's an OBDLink Mx Wifi.

I'll connect it and give it a test drive with the voltage being displayed.

It's interesting because the Engine Failsafe, the DSC 4 x 4, and the brake light did come on earlier in the day. That would confirm what my gut is telling me, that it's the alternator.

For some reason, there's a ton of crud on the alternator. Like something leaked on it over the years. It's covered with black gunk like something leaked on it and then the problem was solved and they never cleaned anything under the leak up.

Also good to know that a wheel sensor would show as an error, not the Trans failsafe. That's helpful in eliminating possibilities.

Thanks for the help so far guys, I'm sure we'll get it sorted out.