VO1OV Posted December 17, 2019 Share Posted December 17, 2019 So, my check engine light came on and a scan revealed this code (P1451); EVAP Control System Canister Vent Solenoid Circuit Malfunction. A local mechanic said to replace the Vapor Canister Vent Solenoid, so I did. Well guess what. Three days later the check engine light came on again with the same code. I don't want to get into this trial and error of replacing all the components at considerable cost and frustration. Anyone experience this before with a good conclusion? I was told to have a smoke test done at a cost of $80. I'm told this test can zero in on the problem with about 80% accuracy. Is this to be my next step, or should I opt for a different diagnosis? Perhaps a DIY test that I'm not aware of. Finally, I need to have an emissions (tailpipe) test done soon. If I do nothing, will the car fail the test for sure? Thanks to those who respond. Cheers, Terry 0 Quote Link to comment Share on other sites More sharing options...
eGuru Posted December 17, 2019 Share Posted December 17, 2019 Perhaps this video will help you troubleshoot. 0 Quote Link to comment Share on other sites More sharing options...
bangster Posted December 18, 2019 Share Posted December 18, 2019 To me that code is specifically an electrical issue and not mechanical or a leak. I don't know what a smoke test will show, unless you also watch PIDs and see if it is commanded open or closed and if it does so. 0 Quote Link to comment Share on other sites More sharing options...
bangster Posted December 18, 2019 Share Posted December 18, 2019 The vent solenoid gets a constant 12v (same fuse as PCM KAM so probably not an issue), and when commanded gets ground on the other side. You can make sure it is getting 12v and not always ground on the other side. I don't know if there is an easy way to command it on to test it. It can be a wiring or a connector issue. 0 Quote Link to comment Share on other sites More sharing options...
eGuru Posted December 18, 2019 Share Posted December 18, 2019 15 hours ago, bangster said: To me that code is specifically an electrical issue and not mechanical or a leak. I don't know what a smoke test will show, unless you also watch PIDs and see if it is commanded open or closed and if it does so. The vehicle self-diagnostics uses readings from the FTP so a leak, blockage, defective FTP (or corroded FTP connector) may cause this DTC. 0 Quote Link to comment Share on other sites More sharing options...
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