GMC Troubleshooting Questions? Ask a Mechanic for Answers
Does the vehicle pull to the left with or without pressing down on the brake pedal?
What is the abs code now?
Since you had to remove the caliper and rotor, was you sure to pump the brake pedal a few times after getting it all back together?
I had just done a abs sensor on my F350 just a few weeks ago and it pulled while braking until after a few miles because I obviously didn't pump the brake pedal enough after completing the job.