Electrical issue

[MelHill]

I just got this 2014 Buick Encore about a month ago at a buy here pay here. It didn't have any issues that I could tell when I decided to buy it. It started throwing codes for O2 sensors within the second week. I'm not so much worried about those.

I have an electrical issue that started with my sunroof not wanting to close. Since then I'm having issues with the infotainment screen blackout then pop back on. Sometimes that screen will go out as well as all dash lights, idle drops a little bit goes right back up.

I initially started by checking all the fuses. I did have to replace a couple and put some missing fuses in spots. I had the battery and alternator checked at the parts store everything is coming out working just fine. I put my OBD computer on it. And it is reading Generator L voltage malfunction.

I have not tested all of the fuses. The main fuses I checked were the ones in the dashboard and rear compartment. There are two more under the hood. One only has four relays in it. The other has mini fuses as well as relays. I am getting ready to check the BCM voltage control fuse. It's just a 5 amp.

I was unable to get to the alternator to take a look at the wiring attached to that. I need to jack it up and get underneath it. I felt the resistance of the belt. To me it does feel a bit loose. And I know a slightly loose belt can cause electrical issues. But I'm not sure that would be the cause of this issue.

Any other ideas of what would cause this issue? Any idea, thought or area to check would be much appreciated.

I am attaching pics of battery/alternator test and the data stream from my computer.

 

[mshultz]

Here are my suggestions. Minimum battery voltage is 12.6V 10 minutes after shut down. At 12.61V, your battery barely passes. I would replace it, especially if it is 3 or more years old. If the alternator belt is in excellent condition, tighten it to specs. Otherwise, replace it. Test all of the fuses, and replace the bad ones. Clear the codes, and then wait to see if there are any more problems.

 

[ulycyc]

If it's only a month old to you I would bring it back and make it there problem to fix. Many states have laws covering used car purchases.