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PCM reprogram for crank position on 2004 Chevrolet Tahoe

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
My GM dealer reprogramed my PCM because the crank position sensor needed to be reset. Seems like the check engine code would come on if this needed to be done or the car would not drive correctly! Any ideas?
(1) Answer
Two of my vehicles had to have the computer reprogrammed, One wasn't shifting right and the other was a recall to reprogram when I dropped it off for a EGR valve replacement and either one had a check engine light on.