You can be convicted of driving under the influence (DUI) in California if you drive:
For most purposes, a DUI is considered a "second offense" if you have one prior DUI conviction that occurred within the past ten years.
This article discusses some of the administrative and criminal penalties for a California second-offense DUI. (Also read about the consequences of a first and third DUI conviction.) However, California has different laws that apply to DUIs on bikes and scooters.
For most crimes, there aren't any formal penalties unless you're actually convicted of the offense (either by entering a plea or being found guilty at trial). With DUIs it's different. If you're lawfully arrested for drunk driving, there can be administrative consequences—such as license suspension and fees—regardless of whether you're ultimately convicted of a DUI.
These administrative consequences come from the California Department of Motor Vehicles (DMV). If you've been convicted or had your license suspended for a DUI within the past ten years and you're caught driving with a BAC of .08% or more, the DMV will administratively suspend your license for one year. The suspension is two years if you refuse chemical testing in violation of California's implied consent laws.
A second-offense DUI is typically a misdemeanor. A conviction carries mandatory jail time from 96 hours to one year. However, in some cases, jail time can be converted to house arrest or work service. Fines range from $390 to $1,000, but a variety of fees and "penalty assessments" will significantly increase the amount the offender actually pays.
Penalties for a second DUI in California also include three to five years of probation, an 18-month DUI school, and a two-year license suspension. (The administrative and criminal suspension periods are allowed to overlap, so the total suspension time won't exceed two years.) However, the person can apply for a restricted ignition interlock license for driving to and from places like work and school. For drug DUIs, the person must complete 12 months of the suspension before being eligible for a restricted license. Whether as part of a restricted license or following the suspension period (where the person does not apply for a restricted license), all second offenders are required to have an IID for at least 12 months.