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If you reset a computer, how did you accomplish that ? Also which computer was it that you reset and what fault code was it reporting ? I'm beginning to think that whenever the big X is displayed, it is telling you that you currently have such a bad problem going on, that a GM service dept will be needed to solve the problem. Since most times that X is displayed, the car seems to be in the*limp home mode* or *reduced power mode*. But of course the dealer is *not always* required for the fix.
The best that I can read (an hopefully understand) is that limp home mode can kick in anytime the ECM detects something wrong with the crank position sensor signal, cam position sensor signal, and pretty much any problem that is detected *as wrong*, with the throttle body assy.
 
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