Once a California law enforcement officer determines that you are under the influence, and arrests you for DUI, disposition of your vehicle becomes an issue.  The officer has the option of impounding your vehicle.  On a first DUI, impoundment is not likely.  The officer will usually immobilize the vehicle or tow the vehicle temporarily depending on where the stop is.

A second or subsequent DUI puts the vehicle at risk of impoundment.  A court can ordered impoundment, but can also make exceptions.  Obviously, if you don't own the vehicle, the Court cannot order impoundment.  In some situations, you can be allowed to drive an impounded vehicle if the court orders it, your driving privileges are not suspended, and an ignition interlock device is installed.

To save your vehicle, and to avoid loss of the vehicle, it is wise to consult with a DUI attorney.