P0446
I just started occasionally getting this code on my 2002 Z71 Magnacharged Avalanche. It currently has 88k miles on it. The code is for Evap vent control circuit so I assume the valve is not closing properly to allow the Evap system test to pass.
Is there any reason I shouldn't just set the code to "don't report" and uncheck the SES-enable box with HPTuners? I can't think of any good reason as I don't believe there will be any negative effects. |
76 views and nobody has experienced advice or knowledge? I was hoping someone would chime in with confirmation that there will be no performance, drivability, or safety related issues.
I have currently set it to give the SES light on the second failure. The Avalanche is not my daily driver so it may take a while to see if that worked. If not, I guess I will just have to uncheck SES-enable, set to don't report, and monitor what happens. |
Originally Posted by Avalanche2002
(Post 5315594)
76 views and nobody has experienced advice or knowledge? I was hoping someone would chime in with confirmation that there will be no performance, drivability, or safety related issues.
I have currently set it to give the SES light on the second failure. The Avalanche is not my daily driver so it may take a while to see if that worked. If not, I guess I will just have to uncheck SES-enable, set to don't report, and monitor what happens. I think you can take and blow compressed air In there to clean it up. Might want to flip it upside down while doing it. Google it -it's common issue in dusty conditions I have also a p0449 code which I think that part is like 20 bucks these days. i never got around to fixing mine |
I just bought the part for like 25 bucks at napa and tossed it in my truck, fixed my issue.
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So a thought just occurred to me that the P0446 code may be part of an issue I noticed with the truck the past 6 months or so - a hard start condition when the truck is fully warmed up. The starter cranks longer than the "normal" for the past 13 years. I'm going to replace the fuel filter first.
I hate to start throwing parts at the issue without diagnosing, but I'm sure I can buy the purge valve, the evap vent valve, and the charcoal canister for less than a shop would charge for a diagnosis. If the fuel filter doesn't take care of it, and I doubt it will, I plan to start with the evap vent valve as the most likely issue, then do the purge valve, followed by the charcoal canister. What's everyone's thoughts about this plan? |
Originally Posted by Avalanche2002
(Post 5316416)
So a thought just occurred to me that the P0446 code may be part of an issue I noticed with the truck the past 6 months or so - a hard start condition when the truck is fully warmed up. The starter cranks longer than the "normal" for the past 13 years. I'm going to replace the fuel filter first.
I hate to start throwing parts at the issue without diagnosing, but I'm sure I can buy the purge valve, the evap vent valve, and the charcoal canister for less than a shop would charge for a diagnosis. If the fuel filter doesn't take care of it, and I doubt it will, I plan to start with the evap vent valve as the most likely issue, then do the purge valve, followed by the charcoal canister. What's everyone's thoughts about this plan? |
I decided to pull the canister vent solenoid off the truck tonight and take a look at it since this seems to be the most common failure mode due to dust accumulation if you drive on gravel roads, which I do on a somewhat regular basis. It was pretty full of dust so I checked on a price; it was $30.99 at O'Reilly so I bought one and installed it. I'll be a happy camper if this was the issue and this one lasts another 13+ years like the original. If this doesn't correct the hard start when hot issue I'll probably do the purge valve and call it a day if that doesn't work.
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I thought I would update this thread in case someone does a search in the future. I've not had a re-occurrence of the code since replacing the vent solenoid.
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