How are PDTCs going to be used as part of a Smog Check inspection? Although the use of readiness monitors reduces the chances of passing a Smog Check inspection with an active DTC, PDTCs can further ensure emission control systems are working correctly. This can have a dramatic impact on air quality and decrease the effectiveness of the Smog Check Program. Some of these vehicles can pass a Smog Check inspection before the vehicle can re-identify the underlying problem that set the malfunction indicator light and DTC(s). Unplugging the vehicle’s battery or using a scan tool are techniques sometimes used to clear OBD information for a vehicle that has an illuminated malfunction indicator light in an attempt to hide the fact that the vehicle is malfunctioning. Why are PDTCs being included in the Smog Check Program? Starting July 1, 2019, the presence of PDTCs will be considered in determining the vehicle’s Smog Check inspection result. When will PDTCs be included as part of the Smog Check inspection failure criteria? The Bureau of Automotive Repair (BAR) has been conducting outreach on the use of PDTCs with the industry and vehicle manufacturers, including two BAR Advisory Group presentations, a separate workshop, two BAR newsletter articles, and ET Blasts. What outreach has been done to obtain stakeholder input? Including PDTCs in the Smog Check Program will implement another OBD inspection development in accordance with California Code of Regulations, title 16, section 3340.42.2(c)(5). What regulations are applicable to PDTCs?
When the monitor runs without identifying a problem, the PDTC will clear itself. The only way to clear a PDTC is to fix the underlying problem with the vehicle that originally caused the PDTC and its corresponding DTC to set, and then allow the vehicle sufficient drive time to re-run the monitor that identified the problem in the first place. However, unlike regular DTCs, they cannot be reset by disconnecting the vehicle’s battery or cleared using an On-Board Diagnostic (OBD) scan tool. Permanent Diagnostic Trouble Codes (PDTCs) are very similar to regular Diagnostic Trouble Codes (DTCs). Permanent Diagnostic Trouble Codes What are Permanent Diagnostic Trouble Codes?
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