California Code, Probate Code - PROB § 8480

(a) Except as otherwise provided by statute, every person appointed as personal representative shall, before letters are issued, give a bond approved by the court. If two or more persons are appointed, the court may require either a separate bond from each or a joint and several bond.If a joint bond is furnished, the liability on the bond is joint and several.

(b) The bond shall be for the benefit of interested persons and shall be conditioned on the personal representative's faithful execution of the duties of the office according to law.

(c) If the person appointed as personal representative fails to give the required bond, letters shall not be issued. If the person appointed as personal representative fails to give a new, additional, or supplemental bond, or to substitute a sufficient surety, under court order, the person may be removed from office.