I have a problem with my abs,04 avalanch on 2004 Chevrolet Avalanche 1500

wondering why the abs pump runs all the time even when key is off,and if its the abs control module,where its located,thank you.

the ecm has dectected pressure in the evap system during a non purge condition
2 more answers
This is a common failure with the ABS Control Modules, there are places that rebuild some of them, so that should tell you something.
The site even has instructions on how to remove the unit!
my check engine light is on