I did a search and found some info. on this. The only problem is my truck has 15,462 miles on it and I doubt the ABS box is bad. My truck is an 07 Silverado W/ a 4.8
I put a cam, LT's and a stall and shift kit in the truck. I ran it at the track and on the 1-2 shift it would hesitate and the ABS light would come on. Now every time I leave in the truck about 4-5 min. later the ABS and brake light come on. It does this every time without fail. WTF.

 

Have you checked to see what codes it was throwing?

 

Under the speedometer section of HPtuners, try setting he General VSS pulses per mile to 81684 ppm.









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check your grounds

 

yeah check the grounds.... I did my ls1 fan sap and when I pluuged the wire into the computer I accidentally cut a ground wire . I checked my book and it showed sevearal grounds so I thought no biggie. Started the truck and the abs light and check brakes message came on.......oh ****! I redid the ground and no problems now....

 

unless someone pinched a harness or wire putting the headers or shift kit on,
you need to get someone to read the codes,
99% of abs lights are for wheel speed sensors,
unless a wire was damaged it should be under warranty anyway, let GM fix it.
autozone etc will read the codes if you don't want to take it to the dealer.