Cal. Bus. & Prof. Code § 22903
(c) No supplier, directly or through an officer, agent, or employee, may terminate, cancel, fail to renew, or materially change the competitive circumstances of a dealer contract without good cause. In addition to the definition in subdivision (l) of Section 22901, good cause exists whenever the dealer has taken any of the following actions:
(9) Engaged in conduct that is injurious or detrimental to any of the following: