N.J. Stat. 2A:53A-13.1
Liability: Volunteer Involved in Emergency Medical or Firefighting Services
A fire fighting or emergency medical services organization volunteer who, in good faith, provides their services will not be held legally responsible for acting or failing to act. They can be held legally responsible when operating a vehicle to provide services.
Liability of volunteer fire company, volunteer first aid, rescue or emergency squad or civil defense unit providing services
No volunteer fire company or volunteer first aid, rescue or emergency squad, civil defense unit, incorporated or unincorporated, which provides services for the control and extinguishment of fires or emergency public first aid and rescue services, or both, shall be liable in any civil action to respond in damages as a result of any acts of commission or omission arising out of and in the course of the rendition in good faith of any such services, or arising out of and in the course of participation in any authorized drill, by any member of the volunteer fire company or the volunteer first aid, rescue or emergency squad, or civil defense unit, and in the case of a volunteer fire company within which a first aid or rescue squad has been created, by any authorized active volunteer first aid or rescue squad worker therefor, notwithstanding that he is not a member of the volunteer fire company. No such immunity from liability shall extend to the operation of any motor vehicle in connection with the rendering of any such services.