Hello, new here. I've had my G for about 7 years now, not many issues up until now. This current one has me scratching my head. So basically when the A/C button is lit up (I guess meaning the A/C compressor is on) the car seems like it loses a lot of power. Lights come on the dash, the car gets very jittery and jolty, when I turn on the windshield wipers they're jittery as well. But the A/C or the heat will blow just fine. A/C is ice cold and the heat is hot. First i thought it was the alternator or something but I got it checked and it was fine. I have no idea what it could be lol any help would be appreciated! Thank you!

 

What lights come on the dash??

 

The slip light, the VDC light, and the check engine. Once i turn the A/C button off, the slip and VDC turn off but the check engine light stays on. It turns off after i drive for a couple days though.

 

Scan the code and see what its saying.