Abs not working

I have a 2000 Gmc Sierra and I recently noticed my abs was not working, and my abs light is not on. I went to buddy's house and hooked my truck up to a tech 2 computer and its pulling a code. It says the pump is stuck open. We tried turning the abs light off and on with the tech 2 and we got nothing. I replaced the gauges when I bought the truck 2 years ago cause the temp gauge was not working. I've checked the dash lights in the gauge itself, all the fuses, and also put the old set of gauges back in the truck to see if the light would come on and it didnt. With the new gauges in it now, when you turn the key to the on position you get no abs light or air bag light. Please help