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one of the known with the bravada-trailblazer-and envoy was the vinal/leather boot cover on the shifter getting jammed and your vehicle also has a park release lever under the boot as well https://www.manualslib.com/manual/654367/Oldsmobile-Bravada-2002.html?page=92 tells how to get out of park --check the trans cable and linkage for damage after releasing shifter
Hi, I exactly I have a gmc 2002 envoy and I have exactly this problem and we just change the oil and all transmission sensor and is still doing it so what problem can be thank you
Sometimes the cable housing slips in the clamp. With the ****** in Park, loosen the clamp and slide the housing towards the end of the cable, then retighten the clamp. Very similar to adjusting the throttle cable on a lawn mower.
If its stuck in reverse then it wont start, this could be a bad tranny or the shift cable broke or came loose, theres a braket under the dash that holds the shift cable before it connects to the shifter linkage arm and that braket sometimes gets loosened up and the other problem is the shifter tube may have broken. a good way to see if its the tranny or the shifter asm is to get under the truck make sure to block wheels and put e-brake on. dissconnect linkage at the tranny and move the selecter arm on the tranny, if it in reverse then it should move o click in one direction which is park and the other way is into neutral then drive and so on, try to get it into park and seeif truck starts, if it does then its not the tranyy but rather it the shifter, another thing before doing that have someone turn key on but dont try to start it just move the shifter and se if it moves the arm on the trany, you will see this from under the side of truck on driverside. good day.
I also have a 2002 Envoy. Shifting to and from 4wh and 4wa can be done on the fly but shifting to 4wL has to be done stoped and while in neutral. Try that. Otherwise I'm afraid its a new computer for you. Its located under the left rear seat and you need a loan for one.
Make sure trans is in park all the way with your hand hit shifter down & push all the way into park. If that works there is a clip in front of shifter that worked out if not the cable may have went bad or came apart at trans near trans pan
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