In Pennsylvania, only the manufacturer gets sued in a lemon law claim.  They are the responsible party, as they are the warrantor of the vehicle. 

I practice law in Pennsylvania with a concentration on Lemon Law and Breach of Warranty issues for vehicles. Many of my potential clients express concern to me over whether to proceed with a Lemon Law claim because they have relationships with the selling dealership. “I’ve bought five cars there, and they always give me a great price.” is something that I hear quite frequently. Other times, its “The service department has been so nice to me, I really don’t want to sue them”. I tell each of these prospective clients that their concerns are commendable, but that they are all for naught.