The input/output speed sensor can be problematic when things get too hot. Clear the codes then go for a drive around the block and see if it goes away.
Obviously there will be a few codes stored. At least one will be a generic trouble code. I don't remember what it was when this came up for me; maybe U0700 or something like that. The other was U0716 (or similar). This was a while ago for me and I'm going from memory only. There was a third code as well.
It may go away and not come back when you clear the codes, but that doesn't mean the problem is fixed.
'09 PSM G8 GT - OPG Intake, DOD-Delete w/ Stage 1C 218/229 .600 Lift 117.5LSA, Kooks 1 7/8 Mids, Solo Axle-Back w/ X-Pipe, SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
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