Went to Yosemite this past weekend, with the tune set to "Tow" I could not pull any grades without the warning message coming on.; I restored the factory tune and did not have any further errors so the problem is obviously related to the Predator.

Error happened again this am on my way to work with 60HP setting. Normal driving up a slight grade, accelerated from 55mph to 65mph.

The trailer brake cannot be unplugged as it's integrated into the dash, not an aftermarket device.

Thoughts?

No, I am running 325/60R20's which is what the Predator tire size is set to as well. I looked in the trouble codes this am, and even though it thinks there is a problem, no codes have been logged.

When accelerating quickly I get the following error message "Service Trailer Brake System". The message is displayed on the DIC along with the Brake and ABS warning lights being illuminated. So far I have only seen this error occur when using the 40HP with Tow Mode enabled and 100HP without the Tow ...

I just had this happen as well. I have been running the Diablo tuner set at "65" with an S&B air intake for about a month now. I changed the fuel filter at the same time and it has been running great ever since.

However today when I got on the freeway, it revved to 2000rpm and then surged and ...

Great, I was hoping that my be the case. I drove it to work today (approx. 102 miles roundtrip), and I did notice an improvement.

I just updated my '05 2500HD/LLY, Allison using the Economy/65HP mode. I also changed the configuration to adjust for tire size (325/60/20) and top-end limiter. I took it out for it's first "test run", and while I do notice a definiite power improvement, the transmission shifting is boderline harsh ...