Strictly speaking, you can. From GCR 8.1.5 (emphasis added):
Any entrant, driver, crew, organizer, or official participating in an event
may protest any decision, act, or omission of another entrant, driver,
crew, organizer, official, or any other person connected with that event
whose actions the protestor believes to be in error or which violate the
GCR, the Supplemental Regulations, or any condition involving SCCA’s
sanction of the event.
Normally, it's the affected driver who protests, but it's not limited to the driver.