'06 Yukon XL 1500 SL, 4wd, no auto-ride, 160k miles

Traction Active comes on the Odometer display inside the Speedo. Pump pulsing sound from under the hood (ABS?), complete cutout of acceleration.
Seems most commonly occurring when starting from a rolling start (like pulling forward from a stop sigh before accelerating out of our neighborhood for example).
This is especially concerning because it has kicked on several times when pulling out turning left in front of traffic, causing to 'stall out' in front of oncoming cars.

What I've confirmed:
Consistently repeatable with a 'very' light foot after a rolling start, hear the pump kick on around 1100-1200 rpm, and the 'Traction Active' would come on the odometer screen. No TC/off or ABS lights on the dash.
2WD/4WD/Auto 4WD no change in symptoms
I'm able to eliminate this symptom by turning off traction control on the dash.

Previous repair work: I had the right hub (entire hub includes hub bearing & bearing sensor, etc) replaced about 2 years ago.
Professional review: I've taken it to a chain-shop that I've had good rapport with. They hooked up to a (not GM-specific) scanner, were able to read wheel sensors and everything looked fine, even while recreating the pump and 'traction active' indication on the dash. They said they couldn't look inside traction control module, and saw no codes set for traction control.
The bearings and hubs felt fine, no play or grinding.

Several questions, largely because I like to know what I'm talking about, even if/when I take it to the dealership.
1) Which module controls the Traction Control System? Is it the 'BCM' body control module, ECM Engine control module, ABS computer, or another?
2) any additional thoughts for DIY/homegrown troubleshooting to check myself before taking it in?
3) anything I can eliminate/rule out, or other suspects I should be adding to the list?


Thanks In Advance
Nick in Milwaukee

 

Additional note, this has been going on infrequently for nearly 2 years, but has gotten much more frequent in the past couple of months.
I do have winter tires (Blizzak) on the car this summer, so the drive is 'soft' with lots of give in the tires, but I wouldn't expect that to be enough to kick on the traction system.
(I hit the winter wear bars so they aren't good for winter any longer, so I thought I'd burn off the rest of the rubber before replacing this fall)

Any thoughts?

 

I get this too on my 2005 Tahoe. From what I have read, it is an ABS sensor on the hub. Too cold for me to replace it just now, but in the meantime you can turn it off pretty easily. Just hit the button on that looks like a car spinning out of control. The bad part about this is when it happens as you start into an intersection, causing the car to stall. Turning it off can save you from that.

As far as replacing it goes, I'm not sure how to tell which of the four is bad, but I'm going to start with the hub that I last worked on. These are about thirty bucks on Amazon. http://a.co/fhR0vON