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Thanks! I tried to but then realized I probably can't lol

He has taken the truck to the local GM dealer, unfortunately there is only one that works on this size truck and he has not had good experiences to say the least. That's kind of his absolute last last resort. But thanks for the concern WarWagon. No one likes to pay big money for someone to fix...

It maybe to soon to say for sure, but we're pretty sure the problem is fixed!! Thank you so much for your help! When I told him about the NSBU, he was fairly sure that it could be the culprit. He ended up taking a blow dryer to it and taking it for test drives afterwards. Initially he only had...

The truck is stock, same tire size. The switch has never been replaced, will tell him to check, Thx!

Thanks though, been getting some advice from different forums. Making progress

Thank you so much! Would this be the same for 4 wheel drive?

Is there a way to check the speed sensor to see if it's faulty?

Great thanks! He found it, cleaned the connections and checked the wires to no avail..

Any idea where the tCM would be?

He said I shouldn't have called it limp mode, because it doesn't shift out of first gear and transmission light comes on. Can clear with scan tool but comes back right away. Thanks!

update: replaced fuel pressure relieve valve, fuel system working good Now getting code P0500.... Speed sensor has been replaced a few times. Truck mainly goes into limp mode if driving through wet conditions.. Or like today, decided to wash truck... Any tests that can be done to wiring harness...

my dad has asked me to post this for him as he's not a computer guy Anyways, he is having the code P0500 come up and has previously replaced the speed sensor a few times I believe. The service truck mainly goes in to limp mode if he is driving through wet conditions. What caused the issue today...

having some issues with fuel system and transmission not slowing truck when going downhill, also at stops must hold break because truck pushing forward. Hoping I'll be able to talk to someone to explain my problem more over the phone...? Thanks!