Hello
I have Chevy silverado 2500HD with 6.0 vortec and 4wd. Model year 2008. Abs light is intermittent and I have read fault codes and it shows multiple codes for front abs sensors, i have replaced both front hubs and sensors and still. I have cleared codes many times.
When i checked live data it shows that rear abs sensor gets proper data but both front sensors shows 0 or sometimes correct but when i drive over 40mph it shows correct data from all wheels. How is it possible what could cause it?

 

Welcome from Florida. Check the wiring to the sensors for any damage and also the connectors.

 

possible broken wiring from the sensor to the ebcm.
post the codes