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limp home mode means something serious could be wrong...if im correct the truck wont let you get over a certain amount of rpm's/speed to prevent something getting torn up in your engine...just get it to the dealership ASAP and dont drive fast!!
Better to be safe than sorry, I would get it to the dealer, it should still be under warranty and it is not worth waiting. It might be a bad sensor, but In my experience the notification lights are not there for giggles....
The wrench light means that there is a problem with your electronic throttle. The accellerator is controlled electronically now, no more cables. Usually the truck will default to a limp mode when the light comes on but I would get it checked out ASAP because if it goes out completely you may get no throttle input.
I had the same problem, wrench light on my '06 6.0 PSD. I took it to the dealer and he showed me a service bulletin that instructed reflashing of the engine computer as the solution. They did that and I haven't seen the wrench light since.
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