triggerbass25

I have a 2013 Energi. Yesterday seemingly out of no where my vehicle wouldn't unlock. I used the actual key to enter and had to start it with the key up to the ignition. Once it was running I got a ton of error messages - power steering fault - speed limited to 80mph I drove the vehicle the 5 mins home with no power steering (i was afraid to turn it off) and shut it off as soon as I arrived and restarted it just fine. All messages were gone. Today I used the key to enter again and had no power. Jumped it off my wife's vehicle and within seconds it started. Checked the voltage and its reading just over 12v while running. After a few minutes of shutting it off it drops down to 11.91v but still starts. Is the battery going out? Is it currently out? Or is there something else that could be slowly draining it that im missing?

I had the yellow wrench icon come on today saying "see owner manual" i turned the car off then back on and it was gone. Drove for a bit then it and the check engine light came on. Used my code reader and got no code so I searched the DTC codes and got C46B86. I havent been able to find any information on. The car drives the same as it always does and doesn't sound any different either. My wife only drives it a few blocks to work so if it isn't something serious we aren't going to fix it because its a 2013 with 104k miles and no warranty left and she literally only drives down the street.