ok just start the truck test for power on will be 5 volts and one will be about 13.0-14.0 with the truck running. you need to test the feed to the pcm with a ohms meter to see if its over 1 volt. if it is the o2 is no good or your running really rich for some reason.

 

It's a new o2 sensor. I haven't had time to diagnose any further. I can tell you the truck runs fine but the throttle feels dead at low rpm and will only downshift 1 gear instead of 2 when floored.

 

I don't think I saw it in previous posts but what brand o2 sensor did you get? Bosch and other cheaper brands don't agree well with these trucks

 

Ntk o2 sensor.

 

I've been having this issue for months, still havent found a fix for the codes yet. Gonna subscribe so I can keep an eye on this

edit: odd question you aren't having any cooling/temp issues are you?