Drive wheel stuck locked

[sbtrucking]

Hello fellas,
Just run in to a problem with my 2008 volvo 670, the truck was parked during a few day rain storm and I went to start it and the front left drive wheel was stuck locked, I tried jerking it back and forth and it wouldn't budge, brake chamber rod was moving just like on the rest of the drives, did this happen to anyone?
Not sure if the pads welded tham selfs or is it something else?
I checked for codes and one came up and won't erase