I had a very similar thing a few years back. Turned out to be rear brakes so could definitely be the caliper. For me it was the pads getting stuck on the sliders and caliper walls and not releasing properly. Warped the rotors as well. Make sure you invest in a fit for purpose lube for the pins and t...

To follow up on this: Volvo USA was able to get me the code. Although the tool on the website did not work and gave an error, probably due to the VIN being from a Euro car, after I contacted customer care with the above images they got back to me with the code in under 6 hours on a Sunday. Amazing! ...