Consider Ethics and Core Values to Become a Business Coach and in Career Coach Certification

What is the impact of having a Code of Ethics and Core Values?  I find variety in how these are explained without a concrete comparison.  What are the implications in your career coach certification and training to become a business coach?  Consider this: the Code of Ethics defines rules of conduct toward customers; Core Values are beliefs from which our behaviors and communication develop.
How does each influence people, teams, and companies?  If the Code of Ethics is written by an industry or company, it serves as a teaching tool and guideline.  Often each employee or professional is expected or required to comply with the Code of Ethics.  Core Values might be different because individuals may or may not agree with the values.  So if values are personal in nature, are corporate values simply accepted if required?  Or are values about behavior and communication while at work only?
What is the impact on coaching clients?  If a coach does not subscribe to, consider, or develop a Code of Ethics and/or Core Values, after their career coach certification and training to become a business coach, is the client aware enough to ask?  Whether or not the client asks, the process means there is some education and thought involved, and generally the quality of the relationship is enhanced. 
How does openly communicating these with the client further enhance coaching?