I was driving my Panamera on the highway when suddenly the psm light and engine light came on and car began to run limb I pulled over and could barely steer the car off the road due to the steering being hard to control I turned the car off and now it do not start back up I read up on it and see it can be a few things wrong did anyone have this issue before?

 

That happened to me once. They took it in and said was a bad coil. Haven't had an issue since

 

Same experience early on in my P4S...turned out to be a bad sensor. Anyway, apparently as a precaution the engine powers-down when PASM fails. Sometimes, turning the car completely off and restarting resets everything.

 

happened to my on my 2012 P4S at 22K miles. Turned out to be engine failure. Porsche replaced with new engine.