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What is wrong with my park lock? Shifting Problems? on 2002 Chevrolet Avalanche 1500

I have a 2002 Chevy Avalanche Z71. So my truck is in park. I step on the brake and try to put it in reverse and it is really hard to put it into reverse, neutral, drive, 1st, 2nd, and 3rd. When i stop and try to put it into park sometimes it dosent go into park and i have to repeat trying to put it into park.
I think it is the park lock that needs to be adjusted. Im not too sure though. How much will it be to fix the problem?

Sounds more like a binding shifter linkage - like a cable issue or something bent. It should be inspected at the transmission, and then inside the vehicle.
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sounds like your shift interlock system may be binding or sticking. If it came on all of a sudden, I would suspect a power or grround problem or perhaps a brake switch. It will require diagnosis before any accurate estimate can be provided.
I guess I can't be on my phone and have it show up as my username.