http://fgalaw.com/practice-areas/traffic-law/fines-and-penalties-for-motor-vehicle-violations/
§ 27-101. Fines and penalties for motor vehicle violations
Violation a misdemeanor unless declared a felony or punishable by civil penalty
(a) It is a misdemeanor for any person to violate any of the provisions of the Maryland Vehicle Law unless the violation:
(1) Is declared to be a felony by the Maryland Vehicle Law or by any other law of this State; or
(2) Is punishable by a civil penalty under the applicable provision of the Maryland Vehicle Law.
Maximum fine for misdemeanor
(b) Except as otherwise provided in this section, any person convicted of a misdemeanor for the violation of any of the provisions of the Maryland Vehicle Law is subject to a fine of not more than $500.
Violations subject to fine not more than $500 or imprisonment for not more than 2 months or both
(c) Any person who is convicted of a violation of any of the provisions of the following sections of this article is subject to a fine of not more than $500 or imprisonment for not more than 2 months or both:
(15) § 18-106 ("Unauthorized use of rented motor vehicle");