Hey how are you
the ABS module is a common failure on this model
but testing is needed to confirm , because we do have 4 abs wheels sensors ,yaw sensor, steering angle sensor ,trac switch etc.. also in the ABS system that could be causing the light on & off.
what you need is a GM diagnostic scanner or equivalent where you can retrieve the fault codes & you can know if it is the module or the sensors.
if scanner was used the sensors can be checked by doing a test drive with scanner hook up and watch if all ABS sensor are reading same speed .
Please let me know if you need anything else on it, just reply back and we will continue
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