The Common GM EVAP Code How to Diagnose and Repair 

The newer trucks have the filter and valve seperated by a length of hose don't they?

Thank you, excellent work. Each detail enabled me to revise my vehicle proper and avoid damage!

This is what a DIY video should be. Thanks and blessings to you.

I looked at so many videos about this and nothing resembled the collection box on my 04 2500hd until I found this video. Thanks and that give me comfort and understanding! And your testing method was great! Thanks again!!

You’re awesome man, I watched as many RU-vidrs as I possibly could explaining mechanics. You have an anointing for teaching. I appreciate your Dedication to this type of work.

Probably the best video I have seen regarding the evac. Thank you! I have a p0449 and have already replaced the purge valve. I will try the vent valve next.

nice job on description and testing. better than many other video I watched on same code. appreciate your work. thanks

My 2007 Silverado has both codes, pretty sure it's the evap solenoid by the fuel tank. The guy I bought it from had a grass cutting business, but the truck just now has 75k miles. It was very dirty underneath. I had both codes associated with this issue, po449 po445, which is the vapor purge valve on top of the intake manifold. I'm gonna change it as well. I usually do a resistance test on stuff, but the old timer I bought the truck from had run over a lot of open ground when he was running his landscaping business, and the top of the old valve was almost off. I've seen a bunch of videos on this very issue and yours is the most detailed, thanks!

Simply WOW! Best video I have seen on this subject period. Thank you so very much. New subscriber now.

Thanks! It's been extremely frustrating hunting and chasing that thing. This detailed break down of them cheap turd vent crap evap helped.. Everything's been replaced, funny thing I started with this, and then ended with it. Good video, I'm convinced they go bad often and just need the quick replace and go on.

Brother Thank you soo much. Im 66 yrs young and retired live working on my cars…YOU WERE A GIGANTIC HELP THANK U….I SUBSCRIBED BROTHER…

Your videos are the best, please keep them coming 👍

Another great how to and why video, nice job and thank you again.

Good stuff sir. Definitely look at a loose fuel cap first. The easiest is often the most overlooked. I've had this code come up 4 times in as many weeks on 4 g m vehicles. Three times it was an incorrectly tightened fuel cap. Cheap fix!

Great video and nice explanation. Got an 02 avalanche I needed some direction on. Thanks!!

Very informative and thorough. Thank you. Great demo on what to look for and location.

Great vid like how you explain and simplify everything in detail thanks

Great troubleshooting on the evap purge! Thanks

Man you're the best I ordered the lifter tool and dod plug from you last week I fixed the stuck lifter on my wife's tahoe I appreciate you hope you have a merry Christmas good luck with your business man you could be as successful as Scotty Kilmer on youtube

I will try that on my 2014 GMC Sierra thanks for the video

great video and very detailed explanation on testing it.

I have a 2008 1500 Sierra crew cab and i get the 442 code small leak detected/change solenoid. Im going to do the test on this when i get home from work today..thanks for this video. It is informative.

Great Video , I thank you so much .

My 06 2500HD evap canister valve went out for the 3rd time. This round I'm going to add a remote pcv filter. BTW thank you showing how to test with 12v.

Your awesome I wish you would get more exposure... soon bro soon

Great overview of that evap component. Last year had a P0446, since that canister was the most likely issue, I simply replaced it for $25. Of course that wasn't the issue. It was the $35 fuel tank pressure sensor which failed. It sits on top of fuel pump. In hindsight, since I got the AFM/DOD tuned off, could have just turned off the evap diagnostics and never would worry about again. I needed to pass emissions while figuring this out: cleared the codes, drove truck for 2 weeks while repeatedly topping the tank, until scanner said 'ready' for all but 1 test, and it passed.

Good job and keep it up

Good info thanks for your time appreciate it

awesome, thank you

Thanks so much

Great video on the simplicity of changing the canister, but why doesn't any of the youtube posters show how to work through the problem of a P0449 code when it isn't the canister but truly is an intermittent vent control circuit issue, and done without a 1000 plus dollar scanner. I am running out of electricians tape to cover the MIL and refuse to buy any more canisters.🤣

sweet truck by the way

Great video. When testing the vent valve, does it matter what pin you connect 12v and ground ? Ty

thanks!

All the GM I've had after 98 all have the constant code, no matter what I changed

Please help I have 2006 1500 5.3 I changed the 2 Port Vent Solonoid and Canister vent Filter and re-did brand new Heater hose 5/8 th's from canister vent filter to the Solonoid even changed the 2nd port that hooks up to the disconnect connector I still have a check engine light I drove 80 miles round trip and it's still on?????? In the beginning before I changed anything the engine felt like a loss of power, after replacing everything the truck sounds good runs good but still have a check engine light I need help

If you wouldn’t mind taring a whole vortec 5.3 apart piece by piece, system by system and doing a video of it all I would highly appreciate that! Really though, You made an awesome informative video man! Thanks for your time/help.

have a silverado 1500hd 6l 2005 have this po449 code changed evap canister,filter etc scanned it still same po449 so i changed evap purge valve on intake, still po449 code...what next??/

I have capless tank and I already replaced purge valve and still have P0443 and P0458 codes. Should I try to replace charcoal canister now? 2019 Silverado 5.3L High Country. Thanks if you can help.

I got a p0451 and a p0446. 2009 gmc sierra 1500. I don't think that its a fuel tank pressure sensors only because it had a full fuel pump assembly in a year ago.

Im dealing with a p0455, tighten cap, the vent valve, purge solenoid, cap and charcoal cannister have been replaced. The tighten cap disappeared for like 3 weeks and code disappeared then came back. I have not replaced the tank pressure sensor or plastic lines.

That’s what a box of female sanitary napkins is for especially if you fleet goes down dirt roads. install and replace every oil change on some FedEx vans. Ford vans have a separate box before the solenoid.

Thank you sir !! Luckily it’s still under warranty, dropping it off next week yours should of been under warranty here’s the info Expires 2035-09-14 or 150006 miles Warranty expiration is based on expiration date or expiration mileage, whichever comes first. Field Action Some 2019 - 2020 model year Cadillac XT4, Chevrolet Silverado 1500, or GMC Sierra 1500 vehicles, equipped with a 4-cylinder gas engine may have a condition that could cause the evaporative emissions purge pump to fail. If this condition occurs, the Malfunction Indicator Light (Check Engine Light) will illuminate and a diagnostic trouble code will set. This special coverage covers the condition described above for a period of 15 years or 150,000 miles (240,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. Repairs Dealers are to replace the evaporative emissions purge pump/canister as necessary. The repairs will be made at no charge to the customer.

Thanks for the video, question- when I look up the part it does not look like the one you took out in the video. I have a 2008 avalanche. The parts I am seeing have two air ports along with the two prong electric port.

Have you ever tried cleaning the filter side and just replace the motor?

I had the po448 code for the evap vent circuit being bad. went and bought a new vent unit as you show here and its still throwing the error code, so now i have no clue whats going on.

I have a 97 suburban. I can't find mine? Is on top of the tank?

I’m looking for the right part number for my 05 Denali any suggestion?

I have a 2015 Chev Malibu with 177000 km and it shows code 0089 and code 0016. Code 0089 says it's the fuel pressure regulator and the 0016 says it's the bank 1 camshaft position sensor. I called the dealership for the price of the FPR and they tell me they don't have one on the computer. A dummy like me believes him because I don't find any videos of anyone working on the 2015 which seems to be different than the others in the engine. Any information would be a appreciated as I have no clue where to find, even the line to fuel pressure test. Thanks

Great video. I have the P0445 and P0449 Faults. I tried replacing the purge valve under the hood first as it was easier to access. Did not resolve the issue. Anyone know where I can find a video of how to replace the canister on a 2010 Tahoe LTZ

I had the code for almost a year after i swapped a fuel pump. I had a hard time finding what was causing it. It ended up being an o-ring on a hard line that went from the solenoid sensor into the evap cannister. The o-ring was inside a female connector.

My 2017 Sierra Denali has no fuel cap. Yesterday I started it up to a ENGINE POWER LOSS message and check engine light. After a few restarts the power loss thing corrected and the engine code is P0446. Not sure what to do.

I have 4 GM cars and trucks, all of them have evap issues. The evap systems on these are poorly engineered. Went through 3 vent valve solenoids on my 04 silverado and it's still having issues. Gave up and have been ignoring the cel for 5 years now. For some reason local emissions station don't plug into obd2 ports on 2500hd trucks here

I just changed mine and the purge & the lights still on . Do I need to change the harness also (05 Tahoe ) ??

I had a P0174, fixed that and two months later I now have P219B. Uggg.

Could this cause a p1400 code also been having rough starting for a while now

Am having problems on my silverado 1500 year 2000 it takes 3 turn to turn on an I have changed the evaporato canister an evaporato selonoid and nothing still same problem

Can a faulty evap sensor/ leaking evap system cause a misfire?

my evap solenoid clicks when I plug in the electrical connector even when the car is off with no keys in the ignition. It also gets extremely hot to the touch, I'm actually scared leaving it plugged in being that it is around the fuel area. It seems like it's stuck open/closed. I got a new part and it does the same thing. Anyone know what could be the problem there? Thanks!!!

Could you test the part with a 9v battery? Or does it have to get 12v

I have a po446 Replaced Evap Purge solenoid Evap Vent solenoid New gas cap Po446 still comes on Any ideas please?

Is it worth doing it? I have an O6 cat eye silverado...I bought an Obd to clear it...It only last a few days and comes back on...If you don't replace it, what's the deal?

if the same part work for a gmc yukon 2007

Hope to hear some good tricks in there because I have performed these replacements three times and keeps throwing code. Sometimes will stop for a bit after replacement, but not long.

Can this cause a misfire?

What year what vehicle what engine size. I've heard so many opinions on this I may have to get a mechanic.

Do You have the part number?

What are the chances that the code might be due to gas cap?

Has anyone started producing an emulator that will prevent EVAP codes?

i could bang the dirt out of that filter once a month to turn off the check engine lite if i gave a shit but i don't any more . i live on gravel roads . what a stupid place to put a filter . tall foreheads at GM were really thinking that day !! million dollar bonus' all around for management

Avalanche not a truck? God Dam i hate when people say that. I've hauled 22' LVLs (3) from the lumber yard to the job with no ladder rack. Can't do that with any other truck. 16 is about the max length for a pickup w/o ladder rack. And I can also carry 5 people to lunch. And guess what, the interior dash and controls are those that were put in all the chevy trucks. No difference there. Just because the bed is attached to the cab. Give me a break i once put 2-55gal drums in the back of my 1500 avy and showed up at a jobsite when they had just finished pouring and I had the drive fill my two drums. Both drums overflowed and concrete was all over the back of my truck. But I drove it home(35 in a 55) 4 miles and poured it in my forms. Cars don't do that. SUV can't do that. Can't haul the wheeler in an suv. And with the duratrac tires I put on it, my avy goes much farther off road that most trucks. Not a truck. Then what is it??? Get over the marriage of cab and bed. Its not a unibody and its incredibly useful you can take the woman out camping and throw a matress in it with tonneau on.

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What is a P1746 code?

is there a way to delete this ehole system some how im sick of this shit 😭😂