This is Samuel and I will discuss this and provide you information in this regard.
So to be clear, at the scene you were ticketed for 22101 (d), you then requested a hearing and it was amended to 22651?
I suggest maybe the correct violation should have been 21651
(a) Whenever a highway has been divided into two or more roadways by means of intermittent barriers or by means of a dividing section of not less than two feet in width, either unpaved or delineated by curbs, double-parallel lines, or other markings on the roadway, it is unlawful to do either of the following:
(1) To drive any vehicle over, upon, or across the dividing section.
(2) To make any left, semicircular, or U-turn with the vehicle on the divided highway, except through an opening in the barrier designated and intended by public authorities for the use of vehicles or through a plainly marked opening in the dividing section.
(b) It is unlawful to drive any vehicle upon a highway, except to the right of an intermittent barrier or a dividing section which separates two or more opposing lanes of traffic. Except as otherwise provided in subdivision (c), a violation of this subdivision is a misdemeanor.
(c) Any willful violation of subdivision (b) which results in injury to, or death of, a person shall be punished by imprisonment pursuant to subdivision (h) of Section 1170 of the Penal Code, or imprisonment in a county jail for a period of not more than six months.
So if you decide to continue to your hearing, you could mention the code cited, even after it was amended is not the correct violation. Keep in mind that it is a misdemeanor crime, and as such, if the court dismisses this without prejudice, it can still be brought and you can still be charged. That means, at this hearing you can be charged court costs and then have the ticket correctly reissued and then you will need to decide if you fight the correct or simply pay the fine.