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Old 08-08-2012, 10:58 AM   #1
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Check engine trouble code P0446, 2000 chev 454

On our trip back from Yellowstone, our "Service Engine Soon" light came on the morning of our last 500 miles of the trip in remote terrain. For part of the day before, I could smell unleaded gas fumes while driving (no leaks) but could not locate the issue. Stopping to borrow a code reader, the trouble code P0446. Based on this and the gas vapor smell, I am suspecting that the issue is related to the EVAP vent or hose. Finding these are easy on "normal" vehicles (near fender wells) but not as so on van chassis. Any suggestions? I'm hoping to not have to pull the dog house as this is a pain on this rig but suspect I will need to.

I've reset the trouble code, but fully expect it to reappear within the next 100 miles.
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Old 08-08-2012, 11:11 AM   #2
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I saw this for that code as possible solutions.
  • Replace Vent valve
  • Repair open, short, or resistance problem in control circuit
  • Repair open, or short, or resistance problem in power circuit
  • Replace PCM
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Old 08-08-2012, 11:37 AM   #3
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Thanks. I found those too. Will go through the troubleshooting options. I found the EVAP canister - it is located above the fuel filter on the drivers side of the tranny. Don't see any physical damage and the return hoses seem fine, so it probably means fun with a meter and battery to test the solenoid, etc. The scent of unleaded fumes is fishy though. (thought while driving it could have been a bad O2 sensor and running rich).
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Old 08-08-2012, 11:49 AM   #4
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Originally Posted by wanderso View Post
Thanks. I found those too. Will go through the troubleshooting options. I found the EVAP canister - it is located above the fuel filter on the drivers side of the tranny. Don't see any physical damage and the return hoses seem fine, so it probably means fun with a meter and battery to test the solenoid, etc. The scent of unleaded fumes is fishy though. (thought while driving it could have been a bad O2 sensor and running rich).

Just a note: If you had a bad O2 sensor you would have a code for that too!
( so you can rule out the O2 sensor as the cause of the gas fumes)
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Old 08-08-2012, 03:53 PM   #5
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Another item of interest is that the main exhaust pipe rests against the frame cross member and has a bit of a rattle where the two intersect. No wear through but that can't be right.
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Old 08-12-2012, 09:29 PM   #6
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This could also simply be a bad gas cap. When filling up check cap.....
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Old 08-13-2012, 07:41 AM   #7
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I do a lot GM vent solenoids. Best thing is to put it on a smoke machine and test activate the solenoids. If the chassis uses the OEM filler neck and fuel tank the check it for rust. Yes, for rust on the plastic tank. The fuel pump retainer ring locks into the tank were another steel ring is molded into the tank, these rust out and leak raw fuel and fumes from the o-ring seal area. Possibly just the vent solenoid, spiders like living in them and raise havoc. Just some info.
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Old 08-13-2012, 09:39 AM   #8
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This could also simply be a bad gas cap. When filling up check cap.....
Could be, the code is for "evap control system vent control circulation error" although a P0457 would be more likely for that.
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Old 08-13-2012, 09:07 PM   #9
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Cap is fine, actually replaced a few months ago for good measure. Hmm on the tank and testing the solenoid with a smoke machine. If interest is that the filler pipe on this rig is actually rubber!
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