With the low voltage code maybe it's the alternator cable?

https://www.6speedonline.com/forums/...r-battery.html

 

Dealership already replaces the cable And gave me a new battery to boot. They are asking me to bring the car back to check the circumference of the rear Hankooks to see if they are off as that would cause the PSM to engage on turns.

 

have them check the tire mounting

 

My PSM light comes on at random as well. I haven't been able to detect WHY. I bought a new battery at the dealer just last month and it still does it. It's driving me crazy. Two different dealers have basically shrugged and said they can't find anything. My worry is that the CPO warranty is running out... I want it sorted before then.

 

Does your PSM actually engage? I probably would not care as much if it was just the light. My car all of sudden breaks loose in a 55+ mph turn for a second and then grabs. It is a little scary and makes me baby the car in turns. NOT Why I bought a Porsche!

 

Not to sound like Cassandra, but whatever warranty coverage you may have is going to draw the line somewhere soon and refuse to pay for more testing until you replace those Hankooks with N-rated tires. A couple of people (and your dealer) already mentioned other common causes, like low voltage. It's worth checking the steering angle sensor and the body yaw sensor while you still have cooperation. If those come up good, the tires are the next most likely cause.

Gary