Touareg: 2008 V8
Join Date: Jan 2016
Second Vehicle: Other
Thanked 7 Times in 6 Posts
If you break all four tires loose at the same time, ESP isn't going to recognize a problem, save for whatever acceleration sensors are present disagreeing with the steering angle input (ie. sensors say you're going straight, yet the wheels are turned left/right). If I mat the throttle on ice or something slippery, with the steering wheel straight, there's a noticeable delay (if I get any before I apply the brakes/let off the throttle) in TCS intervention.
Likewise, lock up all four wheels at the exact same time, and the ABS system won't necessarily work because it operates on a wheel speed differential basis. My understanding is that the Touareg (and I'm sure many other vehicles nowadays) has sensors to detect the actual acceleration of the vehicle to allow the TCS/ABS to work under these circumstances.
Slush is far and away the worst (next to ice) traction-wise that I've driven in, so it sounds like you're just loosing traction at all four corners and the system is "working as intended".