GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry your having this problem
can you get under the truck and see on the drivers side of the transmission if the shift cable has popped off the little shift lever on the transmission
these are very common for the cable popping off the lever
usually aligning the lever by hand and popping the cable back on with a pair of pliers does the trick and if it keeps popping off or will NOT pop back on then either the cable will need to be changed OR they sell online repair kits to change the bushing or the end of the cable which is very cheap to buy and very easy to do as they come with great directions to change the end or the bushing
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