reduced engine power in 4 wheel LOW

[sin_jon]

hey everyone! i put together a 2006 gmc sierra 4x4 5.3 4l80e swapped with a sloppy stage 2 cam and 78/75 charger to turn into a sled pulling truck. we have some rough tunes made up off small driveway hits and had it making and holding my goal of 4lbs of boost while keeping fuel ratio in check. I will be using 4 low when pulling the truck so i wanted to see what the truck did in 4 low, i shifted into 4 low, started loading it up on the foot brake and as soon as i hit 28% throttle position the truck throws a U0107 (lost communication with throttle actuator control module) says reduced engine power on the dash and the truck shuts off. clear codes and restart and it does the same thing, any ideas ?

[gametech]

Without uploading a log showing the problem and a tune showing the current software when the log was made, you are unlikely to get any useful responses.

[sin_jon]

Without uploading a log showing the problem and a tune showing the current software when the log was made, you are unlikely to get any useful responses.

oops my bad first time posting here thought i had it attached 4lo shutdown2.hpl

[gtstorey]

oops my bad first time posting here thought i had it attached 4lo shutdown2.hpl

And tune.

[sin_jon]

And tune.

hail mary final try sept 7.hpt
keep in mind we haven't focused too much on the actual tune due to this problem, its rough

[abc]

Have you run down the diagnostic flow chart for the code. Likely a wiring issue or part failure that only shows up when the additional torque is twisting that thing up.

[edcmat-l1]

Do you have your original unmodified tune file? Looks like the ETC tables may have been changed in this one. That would be your issue if that's so.

[sin_jon]

jordan oct 6 21.hpt this is as far back as 2021 should be stock or very close too it

[sin_jon]

haven't really no, assumed it was tune related do the the fact that it doesn't really even start to torque up in 4 low at all. I will move onto that for now and see what I find, thanks ABC