So i was pumping gas (truck was off) and when i got back in and turned on my truck, i noticed a slight vibration and could hear what sounded like another small motor running. Then i saw my ABS light came on. I turned my truck off, and the noise kept going, even though my truck was off. I dont know if it has something to do with abs module but even when my truck is off its still making the noise. I really got no clue what this one is