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Very common problem on Chevy SUV's Take the sensor out and see if the ABS RING (the little teeth) in that hole are all rusted up. also try taking one of the washers off the Sensor before putting it back in the Bearing Hub. Sometimes the sensor is gapped too far away from the Ring
most likely you have a wheel speed sensor problem and one sensor is dropping out causing traction control to kick in. this works off of abs system. if your abs motor is just running all the time the ebcm has internal failure and would need replacing. there is a ground wire on left side of frame would be rt under drivers side body mount behind front tire. try cleaning this area by removing bolt and scuffing frame if it gets corroded abs will do some funny things. worth a shot wont cost you anything.
low speed activation of abs[will not set off code ] can also do brake studder without touching brake usually does it under 5 mph the problem is one of the sensors is dirty or has some corrosion on it ===chevy back in 2000 did a partial recall on the tahoe for the same problem the fix was to remove the sensor and clean it if the corrosion was to bad than sensor was replaced === the problem with no code is u dont know which sensor is causing problem u would need to remove both and check them
9 out of 10 times this problem arises when a wheel speed sensor goes bad or a corresponding tone ring breaks. the abs light may not come on, and there will be no code in the abs control module in this situation. but what happens is the tone ring goes around an axle or is part of a wheel hub. and it's got slots in it that "excite" the sensor. if there is a crack in a tone ring, it'll work properly most of the time but intermittently will make the abs module think that wheel is spinning at a different speed than the others, making the abs kick on.
Like the other person mentioned, if you have a faulty sensor or bad connection, that would trigger the light. That may also be triggering your ABS to kick in when it doesn't need to. On each wheel, there will be a sensor with some wires coming out of it located on the inside of the axle just behind the rotor. You'd have to test each sensor to determine if one or all of them are faulty.