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07-07-2009, 03:52 PM #1
P0446 EVAP Code (check engine light)Check for SES Light on P0446 EVAP Code check EVAP Valves both working check Vent Calve Found it is covered in mud and has dust intrusion also canister recommend canister and vent valve plus relocate
2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax 6.5" BDS Suspension Lift Key'd to 9" Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection 35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires PPE Tuner until i tune it with my EFI Live Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder Leveling kit & 34.5" Nitto Grapplers 18" XD Rims Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat Electric Fan Autometer Pressure, Boost, and Pyro Gauges 4.56 Gears AFE Stage 2 Intake
07-07-2009, 04:49 PM #2
PO446 EVAP code
I think that was the code my 05 threw back in May and found the EVAP solenoid was bad. GM has a updated solenoid I purchased from local Chevy dealer (couldnt fine a aftermarket part) for $150.00. You have to run a hose from valve to front of truck for the vent. I mounted mine up near brake booster to keep water out when off road. Make sure you use fuel hose for vent line. I think the hose was 5/8 diameter.
07-07-2009, 06:14 PM #3
It is a common problem. Mine was replaced under warranty.Jim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Linux Bed Liner
1967 Landcruiser <350 Chevy>
1990 Geo Metro Convertible
2007 FJ Cruiser
07-07-2009, 07:49 PM #4
07-10-2009, 10:24 PM #5
Never mind, took it to a different shop, and i had them clean out my hoses and the compressor and everything. $70 instead of $1000, i think i made the right choice.
07-13-2009, 11:20 AM #6
- Join Date
- Feb 2009
- FT. Wayne, IN
Here's a write up I did awhile back on this!
http://www.gmtruckclub.com/forum/showthread.php?t=189642003 Silverado LS 1500 Xcab 5.3 vortec 3.73 rear.
2000 Artic White Buick Regal GS, 3.4 pulley, 3"dp, 13.81 @ 101 (sold)
2002 Z28 Camaro, 1sc, a4, slp lid, headers, cb exhaust, 3.73
07-20-2009, 10:52 PM #7
So, two days ago, my check engine light came back on, I go to part source and get my codes read(for free i might add) Threw the same code. So, I knew exactly what happened, either they didn't do a good enough job to clean it, or they didn't put it all back together properly. And after the guy read my codes, i start my truck back up, and the light is off now, did he erase the code? I was planning on going back to the shop i went to and show them my lights back on, and they didn't fix it properly. If they read my codes again, will it show up? Or will did the guy erase it? And it wont show up anymore...?
07-20-2009, 11:13 PM #8
07-21-2009, 12:48 PM #9
So, if i wait will the light come back on? Or am i basically screwed now?
07-24-2009, 10:40 PM #10
- Join Date
- Jul 2009
- west palm beach fl
had same problem
i had the same code on my 2005 tahoe. i used alldata to help me with pictures and descriptions. removed vent valve and inspected. ended up purchasing new valve from dealer for $30.00, installed and cleared code with scan tool. problem is gone. did the repair back in january.
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