GMC Troubleshooting Questions? Ask a Mechanic for Answers
those codes can be messy to go after to narrow this problem down
3 out of the 4 are wheel speed codes set and i have never seen all 3 go out or bad at the same time
now the 237 codes is interesting as it relates to the internals of the pump motors ground and powers
if the wiring looks good to the ABS module it is best to search online or call your local auto junk yard and pick up a complete ABS module assembly and install it into this vehicle as to find a new module and hydrolic unit would run well over $ 1000 easy
if you have any questions please ask as you can always get me back for FREE through this post any time with any follow up with this question even after you rate us here at Justanswer
will it somewhat run on starting fluid being sprayed down the throttle body ?