I have a 2005 GMC LLY with 181K miles. A few days ago the ABS-Brake light came on along with "Service Brakes" on the DIC. It will stay on one trip and off on another. I cannot tell any difference in braking. Fluid looks good. From other threads it sounds like it could be the ABS module, but did not see any reference to coming and going as far the lights and DIC message. Anyway to confirm it being the ABS module or any other suggestions much appreciated? Thxs!