Could an ear infection cause my jaw to hurt and feel locked?

Not sure: I'm not sure an ear infection could cause those symptoms. However, tmd (temporomandibular joint dysfunction) could cause symptoms of an ear ache or ear infection. The TMJ (temporomandibular joint) is in close approximation to the ear. If there is inflammation going on around the joint it could be putting pressure on the ear. Jaw hurting and feeling locked are signs of tmd. I'd see a dentist.