View Full Version : 2012 2500hd with E78 like to get more torque

January 2nd, 2019, 07:48 AM
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.

January 2nd, 2019, 09:36 AM
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.

January 2nd, 2019, 09:59 AM
Hopefully this works, first time.

January 2nd, 2019, 10:03 AM
Here is PID running still giving p0138 p0036

January 3rd, 2019, 06:53 AM
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.

January 3rd, 2019, 07:03 AM
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