(a) Except as provided by Subsection (b), a volunteer is not liable for damages arising from an act or omission that results in personal injury, death, or property damage if the act or omission is:
(1) in the course and scope of the volunteer's duties as a volunteer; and
(2) not intentional or grossly negligent.
(b) A volunteer is liable for personal injury, death, or property damage proximately caused by an act or omission related to the operation or use of any motor-driven equipment to the extent of the greater of:
(1) the amount of financial responsibility required for the motor-driven equipment, if any, under Chapter 601, Transportation Code; or
(2) the amount of any liability insurance coverage that applies to the act or omission.
(c) In this section, "volunteer" means an individual rendering services for or on behalf of the department who does not receive compensation in excess of reimbursement for expenses incurred.