Code 379-04?

Getting this code along with the service 4wd. When shifting from 2h to auto it blinks and takes 20 seconds before switching. It goes to 4h and 4lo faster. I can hear encoder motor click but after watching scanner live data the front axle never engages. I replaced front actuator with gm oe part and didn’t help. Tested actuator at connector and it’s not getting power. Also not getting power at midway point near fuse box. Pulled harness from midway point to actuator and removed plastic covering and found no damaged wires and both connectors looked fine with no corrosion. Wondering if it’s a grounding problem or a damaged wire between the tccm and the mid point connector or just a failing tccm? New parts include tc encoder motor, front actuator and ignition switch. Checked and cleaned as many grounds as I could but I’m sure I’m missing a few. What grounds would be most relevant for my problem? Also when I watched scanner live date you could see that the command was given to go from 2h-auto-4h-4lo but it would never say engaged on front axle. Not sure where else to turn unless it’s replacing tccm.