'16 KW T680 abs light, trac light, and adaptive cruise fault

Hey their guys, I'm having issues with my adaptive cruise I have the traction control light as well as the abs light on in the dash...says I have left wheel speed sensor fault code....the sensor has been checked and it's ok and to spec...had truck towed 2miles to dealer when the diff went out got the truck back a month and a half later day after picking up all those lights came on...would go off intermittently for a few weeks but now they've been on the dash for some weeks and they're not turning off anymore...I've seen someone say they replaced the abs harness but what else could it be besides that....