You (probably) did not commit a crime in Colorado.
The answer to your question though is probably Driving an unsafe vehicle
Colorado Revised Statutes Title 42. Vehicles and Traffic § 42-4-202
(1) It is unlawful for any person to drive...on any highway any vehicle...which is in such unsafe condition as to endanger any person, or which does not contain those parts or is not at all times equipped with such lamps and other equipment in proper condition and adjustment as required in this section and sections...
The above is not a crime , it is
(5) Any person who violates any provision of this section commits a class A traffic infraction.
A class A traffic infraction is a civil violation.
Note that some driving offenses are crimes: In Colorado, driving more than 25 mph over the posted limit is a class 2 misdemeanor, and doing so in a constriction zone is a class 1 misdemeanor.
Also note that I say probably because it is possible that they charged you with something more extreme- reckless driving? violation of noise or pollution ordinances?- but for a fine small enough that you don't say, 2 points, and you did not have to go to court (you could have if you wanted for the ticket, but not required) it is very unlikely.