The California Vehicle Code section outlining auto theft. Also closely related to 496d PC (posession of a stolen vehicle or vessel)
§ 10851. Theft and unlawful driving or taking of a vehicle
(a) Any person who drives or takes a vehicle not his or her own, without the consent of the owner thereof, and with intent either to permanently or temporarily deprive the owner thereof of his or her title to or posession of the vehicle, whether with or without the intent to steal the vehicle, or any person who is party or an accessory to or an accomplice in the driving or unauthorized taking or stealing, is guilty of a public offense and, upon conviction thereof, shall be punished by imprisonment in a county jail for not more than one year or in the state prison or by a fine of not more than five thousand dollars ($5,000), or by both the fine and imprisonment.
(b) If the vehicle is (1) an ambulance, as defined in subdivision (a) of Section 165, (2) a distinctively marked vehicle of a law enforcement agency or fire department, taken while the ambulance or vehicle is on an emergency call and this fact is known to the person driving or taking, or any person who is party or an accessory to or an accomplice in the driving or unauthorized taking or stealing, or (3) a vehicle which has been modified for the use of a disabled veteran or any other disabled person and which displays a distinguishing license plate or placard issued pursuant to Section 22511.5 or Section 22511.9 and this fact is known or should reasonably have been known to the person driving or taking, or any person who is part or an accessory in the driving or unauthorized taking or stealing, the offense is a felony punishable by imprisonment in the state prison for two, three, or four years or by a fine of not more than ten thousand dollars ($10,000), or by both the fine and imprisonment.
(c) In any prosecution for a violation of subdivision (a) or (b), the consent of the owner of a vehicle to its taking or driving shall not in any case be presumed or implied because of the owner's consent on a previous occasion to the taking or driving of the vehicle by the same or different person.
(d) The existence of any fact which makes subdivision (b) applicable shall be alleged in the accusatory pleading, and either admitted by the defendant in open court, or found to be true by the jury trying the issue of guilt or by the court where guilt is established by plea of guilty or nolo contendere or by trial by the court sitting without a jury.
(e) Any person who has been convicted of one or more previous felony violations of this section, or felony grand theft of a vehicle in violation of subdivision (d) of section 487 of the penal code, as that section read prior to being amended by Section 4 of Chapter 1125 of the Statutes of 1993, or section 487h of the Penal Code, is punishable as set forth in Section 666.5 of the Penal Code shall be alleged in the information or indictment and either admitted by the defendant in open court, or found to be true by the jury trying the issue of guilt or by the court where guilt is established by plea of guilty or nolo contendre, or by trial by the court sitting without a jury.
(f) This section shall become operative on January 1, 1997.