Permanent Diagnostic Trouble Codes have been used in California as a criteria for passing or failing an emission inspection since July 1, 2019. The Permanent Diagnostic Trouble Code (PDTC) pass or fail criteria is applied to 2010 and newer model vehicles that support PDTC's. Permanent Diagnostic Trouble Codes are very similar to regular Diagnostic Trouble Codes (DTC's), however, unlike regular DTC's, they cannot be reset by disconnecting the vehicle battery or cleared using an On-Board Diagnostic (OBD) scan tool.
This video will explain the PDTC in detail along with the setting of a PDTC and observing the results on a scan tool. Although PDTC's are capable of being stored in most 2010 and later model year vehicles and California uses the PDTC as an emissions testing criteria, this does not necessarily apply to other state emission programs. Check your local state emission testing requirements for information regarding testing in your state.
Below is a link to an information page on the California Bureau of Automotive Repair web site that has a detailed description of the PDTC and how it can be used to help verify a proper vehicle repair has been completed. I hope that you find this information useful.
www.bar.ca.gov/industry/pdtc
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