Does anyone know the cause of these codes

I bought this truck used from a bug here pay here place long story short she ran like a champ then after only 2 -3 months of having her she broke down. I got the carfax and no flood damage and etc and I’m the third owner so I’m unsure of the stuff it went thru before me and when with me I took great care of it but since it’s broke down I haven’t been able to figure out how to get it working. A mechanic told me it needed new timing chain amd once he got the truck to the shop he told me it would be better to rebuild the motor so he did that but then told me it had electrical problems but he could t do that. So here I am and I did find some bare wires at the ignition coils so I put some electrical tape on them and now Ive just got one o2 /sensor wire connector replacement that’s wires don’t match the colored wire that goes to the harness the new connector wires are all white and the ones coming from harness are red black orange and one more color I’ll have to look them I was going to see what it does after I hook that up but I wonder if the computer is bad??

electbc said:

What year? I have some earlier model Lambda service info in the PDF links. Is does change some from year to year but this is all I have.
Since a lot was disturbed doing the engine work, make sure all the grounds are connected properly and check the engine compartment fuse block, it has a tendency to be loose, especially after repairs and not re connected properly. Then also check other connectors making sure they are tight and no bent pins. One of the wiring diagrams should show wiring to your O2 sensor. Use the search function on the PDF to find what you are looking for.

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TJANK YOU SO MUCH I’m copying my reply to another person to let ya in on where I’m at so far ….

Bought at buy here pay here place no accidents no water and it just lost power and wouldn’t go and kept throwing codes so many different ones and one day the cat glew orange and then it wouldn’t drive after that but now I was able to rewrite an o2 sensor back the correct way and from there I cranked it up I’m posting a video I’m not sure what the noise is but this is where I’m at I’ve also checked all grounds with car crunk and just on acc. All is well. But that Tcm keeps whining and that I don’t get which I’m k mechanic just a single mom with some work ethic and no give up in my blood lol any advice or help is so much appreciated you have no idea
And how can I post videos to show the sound it making

MandaPanda089 said:

But that Tcm keeps whining

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Are the ABS/Traction control lights on? Does your speedometer read accurate?

Is the fluid level good? It's next to impossible to read the transmission dipstick, almost drove me nuts. At night, with a flashlight and a paper towel is my best advice. Drive it for at least 5 minutes first. Over/under-filled will both cause the whining noise.

If no ABS/TC and the fluid level is OK, well, the whine is coming from a solenoid. There are possible causes you can check. Debris, electrical short, valve body valve sticking, pressure switches, even disconnecting the TCM connector with the red latch and resetting might work. The GM tech II tool also has an option to make the transmission solenoids preform a self-cleaning procedure. I made buddies with a guy on kijiji who rents his Tech II for $50/hr lol.

Replacing one solenoid is not an option tho. Despite what I read, I wanted to try with a module I replaced. 2 hrs, a heat gun and a saw later, I finally pulled one out from a puddle of cut up, melted plastic...