Use https://www.assist.org to check transferability of California community college courses to UCs (including specific lists of courses for your major). AP score credit can be checked on the web site of each UC campus.
UCs normally admit junior transfers who could theoretically graduate in two years (four semesters or six quarters), although for some engineering majors, lack of engineering prerequisites at community colleges may need more than four semesters or six quarters after transfer. But note that campuses may have limits on the number of semesters, quarters, or credits you can have and continue to register. Limits for engineering majors:
UCB: 5 semesters after transfer entry
UCI: 236 total quarter units and 10 quarters after transfer entry
UCLA: 213 total quarter units
UCM: ???
UCR: 120% of the total number of quarter units in the major plan (216 for electrical engineering)
UCSD: 6 quarters after transfer entry
UCSB: 215 total quarter units and 9 quarters after transfer entry
UCSC: 135 quarter units after transfer entry and 6 quarters after transfer entry
Note that credit from high school (AP, IB, college courses taken while in high school) does not count toward unit limits, and at most 70 semester or 105 quarter units of lower division courses will be given transfer credit (all courses will count for subject credit). Exceeding the unit or quarter/semester limits listed above requires getting permission to do so, and presumably means having a course plan to complete all requirements as soon as possible to graduate.