2012 2500hd with E78 like to get more torque

[lsx_old_cars]

I have a 2012 6.0 2500hdwt with a E78 I thought cruise ecm) this thing is a dog towing. Is there anything I can do to give it more power ? It has a P0138 code swapped sensors didn't go away. I have all the right voltages at the plug. Dealer says probably ecm ? I'm thinking of disabling all sensor2 DTC and MIL dealer actually said good idea which shocked me.
When it has an empty trailer on it can't out pull a cruise. Any help would be appreciated. I was searching for tunes that people tried but didn't see any and I searched here for torque or more power and didn't see anything for this truck.

[ScarabEpic22]

Post the stock file up and a log if possible.

Yep, E78 is the same ECM as the 1.4T in the Sonic/Cruze use. It's a TQ based ECM ala E39/E92, so opening up the TQ tables will likely help a bit (not as much as on a turbo engine though). Have you tried running premium fuel and seeing if you get any more power? If it's knocking on 87, using better gas may help.

[lsx_old_cars]

22589
Hopefully this works, first time.

[lsx_old_cars]

22590
Here is PID running still giving p0138 p0036

[ScarabEpic22]

You said swapped sensors, did you replaced the one that's currently in B1S2? I'd start with that, probably less than $50 for a sensor especially the downstream ones. Both those codes are related to B1S2, heater and voltage circuits are wrong. You mentioned the wiring is correct so I'd start with a sensor.

If that doesnt work, then look at killing the rear O2 DTCs. Just means if your cats go bad, you won't know until they're extra clogged and your mpg tanks.

[lsx_old_cars]

I swapped b1s2 with b2s2 code stayed the same. I thought the PID's looked the same b1 to b2 it's not lighting the mil now but the code won't clear. I think I'm going to take it for a 100 mile ride if the light don't come on let it go... if it comes on disable downstreams