Sometimes it comes on. But not all the time. When it does come on I turn off the truck and take the brake fluid cover off and it shuts off. Sometimes I just shut it off and turn it on and it goes away. The brakes seems to work fine.

 

The system is detecting a problem with the ABS and disabling the ABS. The brakes will work but not the ABS. Sometimes cleaning or replacing the sensors will fix the problem. Sometimes the ABS module needs to be replaced!