what would cause VSC or traction control systems to make beeping warning sounds?

tires are all the same size but i checked couple of days ago and both front tires were a bit overinflated. Both front tires were about 38-39 psi and both rear tires were about 34 psi.

both front tires were overinflated, about 38-39 psi, and both rear tires were about 34 psi. There was no type of sensor attached to the spare tire. The warning light on instrument panel and the beeping noises have not come back in the past week or so, and i just corrected tire pressure about 2 days ago, all tires now about 34 psi.