2014 Silverado with 291000 miles

[MikeBMW]

A friend of mine has a 2014 Silverado 1500 (Z71 package with 2WD) but I'm getting oxygen sensor codes all over and crank position sensor and and on and on.
If anyone can take a look at this scan and clue me in, I would appreciate it.
issues.pdf

[mikeyk101]

Wow! Did those all show up just now? I would say that it's probably something else other than sensor failure as that's an awful lot of faults. If it were me, I would think shorted wiring somewhere or the old standby of ground problems. There is one ground I remember seeing on a YouTube video that attached from the engine to the driver's side of firewall and looks like a ground strap. In the video, it had gotten corroded so much, it was basically disintegrating. Maybe take a look for that one and see what you find. 

 

I'm really not good with electrical troubleshooting but can usually muddle my way through it.

[Buckwild27]

My 13 Sierra pulled some like that there was a couple wires that pulled out of the bulkhead in the firewall. 

[silveradosid]

i would not trust that autel scanner, my autel 808 gives me codes that for option not even on the truck. and always gives me codes for the radio and heater. when i use gds2 , it will test fine. this is on my 2020. with this many codes the truck would run like crap or not at all. i would start by removing every ground , cleaning and reinstalling. the 5 volt ref code is important, as most of the sensors use that 5 volts

[MikeBMW]

13 hours ago, silveradosid said:

i would not trust that autel scanner, my autel 808 gives me codes that for option not even on the truck. and always gives me codes for the radio and heater. when i use gds2 , it will test fine. this is on my 2020. with this many codes the truck would run like crap or not at all. i would start by removing every ground , cleaning and reinstalling. the 5 volt ref code is important, as most of the sensors use that 5 volts

The Autel scanner has been great for me on my 2017.
It's kept me from from more than a few trips to the dealer.
YMMV

[JimCost2014]

Are those all active codes, or ones that could be present (just a list)?

[MikeBMW]

8 hours ago, JimCost2014 said:

Are those all active codes, or ones that could be present (just a list)?

It's a mix, I guess, but I cleared all codes and these kept coming back.
He just had his catalytic converters changed out and I'm thinking the shop failed to reconnect all of the harnesses.