Root Cause Analysis Requirements per TS 16949:2009

Does there need to be written evidence to show how a root cause was determined, such as a "5 why", in the problem solving methodology to satisfy ISO/TS 16949:2009 requirements?
Thanks in advance.

in 8.5.2.1 of the standard, there is a requirement that reads

If a customer-prescribed problem-solving format exists, the organization shall use the prescribed format

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So, in that case, yes, there must be evidence of the methodology used and the details of the (root) cause investigation.

Thanks. What if it is not for a customer issue? Such as an internal non conformance or internal audit finding?

Then, it is a gray area. 8.5.2 e) requires records of "actions taken". But not necessarily records of the cause investigation.

As always, if you are disputing the validity of an NC, you are entitled to ask the NC initiator what exactly is the requirement they are reporting as nonconforming.

Aside from the "requirements" question, wouldn't it seem to be a good idea to do so? If done right, that's pretty good information that can be captured and used.

Absolutely! I was just pondering a minor write up that was received during a TS 16949 re-certification audit.
Thanks for the input.

wildbill72 said:

Absolutely! I was just pondering a minor write up that was received during a TS 16949 re-certification audit.
Thanks for the input.

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I know our auditors have stopped on root cause in the past. We have had discussions. I think one of our customers has a CSR requiring a 5y or something. It can be helpful in certain situations, but necessary for all. IMO, It should be "where applicable." Good luck.

If you're going to take the time/effort/resources to do a RCA then there should be sufficient documentation so that others can see the evidence as to what the causes were. Otherwise it's likely to be a punt (e.g., human error, retraining).

IMHO
Universally Root Cause Analysis is probably the weakest area in general in companies