Chevy / GMC - P0446 EVAP System Vent Performance Problem
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Date: 2020-08-05
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Comments and reviews: 10
David
I did the pressure sensor on my 2005 Silverado 2500HD by Braille on the pavement in my driveway laying on my back and reaching up between the frame rail and the bed floor. The long forked trim rivet pry tools for the Christmas-tree trim plugs will pull the sensor. Thankfully mine didn't break off. Not fun but doable. I put Sil-Glyde on the nitrile gasket.
The GM PCM eventually checks the circuit resistance through the pressure sensor and it will set a code if the circuit is open or shorted. IIRC it's P0451 but don't quote me on that.
0. 22v must be a common sensor failure voltage.
reply
I did the pressure sensor on my 2005 Silverado 2500HD by Braille on the pavement in my driveway laying on my back and reaching up between the frame rail and the bed floor. The long forked trim rivet pry tools for the Christmas-tree trim plugs will pull the sensor. Thankfully mine didn't break off. Not fun but doable. I put Sil-Glyde on the nitrile gasket.
The GM PCM eventually checks the circuit resistance through the pressure sensor and it will set a code if the circuit is open or shorted. IIRC it's P0451 but don't quote me on that.
0. 22v must be a common sensor failure voltage.
reply
Jeff
I commented on your other EVAP vid - P0455. I chased that money light rabbit to no avail. Saw this vid and decided to check the fuel tank pressure sensor. I could check & verify voltage but that was it. Replacing the vapor vent solenoid and purge valve didnt correct the fault so I ended up at the fuel tank pressure sensor. I did not raise the bed or drop the tank. Sure as heck the sensor tip broke off. Got the soft sensor seal out and was able to wiggle the new sensor in. Did the specific GM drive cycle a couple of times and the permanent P0455 was gone. Much appreciated!
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I commented on your other EVAP vid - P0455. I chased that money light rabbit to no avail. Saw this vid and decided to check the fuel tank pressure sensor. I could check & verify voltage but that was it. Replacing the vapor vent solenoid and purge valve didnt correct the fault so I ended up at the fuel tank pressure sensor. I did not raise the bed or drop the tank. Sure as heck the sensor tip broke off. Got the soft sensor seal out and was able to wiggle the new sensor in. Did the specific GM drive cycle a couple of times and the permanent P0455 was gone. Much appreciated!
reply
David
When you get a check engine light with a code of p0446 that will not tell you what component is failed unless you have a bi-directional scan tool. If you do not have a scan tool what direction should you go with only the P0446? A code reader will not show you specifics either. So I guess when automobiles went from a analog system to a digital system with networks and ECM's you have to have a scan tool to troubleshoot today's vehicles.
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When you get a check engine light with a code of p0446 that will not tell you what component is failed unless you have a bi-directional scan tool. If you do not have a scan tool what direction should you go with only the P0446? A code reader will not show you specifics either. So I guess when automobiles went from a analog system to a digital system with networks and ECM's you have to have a scan tool to troubleshoot today's vehicles.
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Jeff
Does a diesel have the same thing on a ole 95 gmc 6. 5 cause Im having fuel issues thentruck stalled usuall its air in the lines so I vent the fuel filter to day the fuel filter was fine so I checked fuel cap and whoosh air came out and my truck started up the other day it was a pig on diesel fuel so maybe a leak I dont know any ideas I changed my fuel filter so now I will have to see
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Does a diesel have the same thing on a ole 95 gmc 6. 5 cause Im having fuel issues thentruck stalled usuall its air in the lines so I vent the fuel filter to day the fuel filter was fine so I checked fuel cap and whoosh air came out and my truck started up the other day it was a pig on diesel fuel so maybe a leak I dont know any ideas I changed my fuel filter so now I will have to see
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Paul
Hey eric i noticed when your using the OTC u have those applications open in the background close them out and always use one program at a time. 2 at max. Backround applications are still running even though your not actually on it using it. Its taking up your ram on device. Hope this helps with all your scan tools. Always close out when your done ull see a huge difference
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Hey eric i noticed when your using the OTC u have those applications open in the background close them out and always use one program at a time. 2 at max. Backround applications are still running even though your not actually on it using it. Its taking up your ram on device. Hope this helps with all your scan tools. Always close out when your done ull see a huge difference
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Patrick
I have the same code on my 05 GMC Canyon. Already did the vent valve solenoid because those always go bad code still came back. when I hook it up to my big scanner it says that there's vacuum in the system all the time even when I take the gas cap off so I'm wondering if it's just the fuel tank pressure sensor it's reading -30 vacuum all the time even with a cap off
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I have the same code on my 05 GMC Canyon. Already did the vent valve solenoid because those always go bad code still came back. when I hook it up to my big scanner it says that there's vacuum in the system all the time even when I take the gas cap off so I'm wondering if it's just the fuel tank pressure sensor it's reading -30 vacuum all the time even with a cap off
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badeldorado
it's not rocket science- the EPA tree huggers sticking their noses where it don't belong. engineering and millions of dollars in replacement parts is the driver- another brilliant scam is paying these idiot automakers for software programming out shear greed to support failure.
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it's not rocket science- the EPA tree huggers sticking their noses where it don't belong. engineering and millions of dollars in replacement parts is the driver- another brilliant scam is paying these idiot automakers for software programming out shear greed to support failure.
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Cristian
Hi Eric awesome video very informative, can the pressure sensor cause the purge valve to open and close rapidly I recently replaced my purge valve and vent celonoid and Im hearing a taping noise coming from purge valve as if it were opening closing rapidly, thanks in advance
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Hi Eric awesome video very informative, can the pressure sensor cause the purge valve to open and close rapidly I recently replaced my purge valve and vent celonoid and Im hearing a taping noise coming from purge valve as if it were opening closing rapidly, thanks in advance
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David
Your component was defective but if you do not have a scan tool can you give the components a good cleaning as well to sometimes correct the P0446? All I have is a code reader. Im a diy person retired and on a budget any budget scan tools out there?
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Your component was defective but if you do not have a scan tool can you give the components a good cleaning as well to sometimes correct the P0446? All I have is a code reader. Im a diy person retired and on a budget any budget scan tools out there?
reply
Scotty
I learned a lot from you you are very very good mechanic please keep your videos common you help out a lot of people because when you bring it to Chevrolet their outrageous with their prices so thank you for that
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I learned a lot from you you are very very good mechanic please keep your videos common you help out a lot of people because when you bring it to Chevrolet their outrageous with their prices so thank you for that
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