VSC kicks on and loss of power

I have a 2008 SR5 Double Cab
I recently had slightly larger tires put on with an alignment and zero point calibration done. Shortly there after the VSC light would kick on and a loss of power would happen. At times there is loss of power without the VSC lights. It helps to turn off the VSC or put it into 4wd but doesn’t always fix it. I just took it into the dealer and they did a ZPC again and felt confident it would fix the issue. It didn’t. Any ideas?

The following items have been replaced:
New wheel bearings (all 4)
New brakes (rotors, pads, calipers)
New CV shafts
New upper and lower control arms
New leveling shocks (all 4)
New rear leaf springs
New inner and outer tie rods

 

At one point I had an error code of U0126 lost communication with steering angle sensor.

 

This would probably be an electrical issue, as no other code is coming with the U0126. Best way is to check fuses first, then look for the can bus and check for loose grounds.

 

I’ve checked the fuses and they are all intact. How do I check the can bus and grounds?