2015 Chevy Cruz Overheating

My most recent issue with my 2015 Chevy Cruze the door locks start locking and unlocking by themselves rapidly while in motion or while idling, shortly afterwards the door open light notification comes on saying that my left rear door is ajar when it's fully closed and the chime dinging noise goes off Non-Stop and intervals and is extremely annoying. Not to mention my cooling system is all out of whack, when I turn the air conditioner on about 15 minutes later it'll register as overheating turn off engine. The water pump has recently been replaced, the water temperature sensor was replaced recently as well. The cylinder head has been replaced with in the last 3 months. The Error Code for the most recent issue I'm having is P00B7 (ECM-ENGINE SYSTEM).I'm at my wit's end with this vehicle can somebody give me an idea of what might be going on with this car please?