2008 5.3/4L60e Silverado 4wd...tuned it and recalibrate for taller tires, abs light came on.

Searched around and couldn't really find a good answer....first of all, I forgot about the tire/gear calculator function being screwy in newer vehicles and did it that way which tripped the abs/brake light after a short drive...I went back in and changed the VSS pulse from 655 to 607.7 and multiplied the shift points & tcc by 1.077, the correction factor I calculated and reflashed... GPS speed check verified the speedo was accurate and everything shifted nicely too....owner took the truck home happy then texted saying the abs light is back on.

My WiFi is down so I'll have to post the tune later but does anybody know what I may need to do here?

Thanks