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Randomly yesterday, my PCM screen read some error message to the effect of "Amplifier, CD Changer, Navigation ....not found".

I turned the iginition off, opened the rear CD changer to see of something had come loose, or the cartridge was ejected, but that was fine. Started the car and the same error message came across the screen. I played with a few buttons on the bottom (Main Menu, Phone, Nav, etc) and still nothing. I put the truck in reverse and the rear camera triggered the screen to show the path behind me. Shut the iginition off again and it worked when I turned it on. No problem since.

I have a 2008 CTT w/ factory phone unit module and handset, rear view camera, nav and aftermarket Tookie for the phone only.

Tookie was the only aftermarket item (installed by the Porsche dealer). It wasn't extremely cold or hot that day if that can sometimes be a factor.

What happened? is this a common occurrence?

What should I do next time.

Was wondering if it is a linkage issue having to do with optic cables or something, or maybe a software error?

My Benz used to pull this sort of drama when it was below zero once in a while!

I'm going in for routine service soon and want to have an idea what to tell the tech.

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