Welcome to the forum.

Might check the emissions warranty as it might be covered under that. I think it's a 5/50 warranty.

 

We had the same issue with our 07 Tahoe with less than 36K on the clock. GM has lost a long standing customer for good----------- we paid the $150 and then had the same problem within a month and I ended up fixing it myself, a real no-brainer. As far as an answer to your question yes the parts are available even from the dealer. A point of interest is that I find it hard to believe that you need a new canister so soon. It can be as simple as the hose from the valve to the canister popped off as ours did after a GM TECH fixed it for $150. Ripped off by GM.

 

Am auto parts on my o4 silverado part #214-2149 found cheaper on e-bay for the solenoid.Took my solenoid off and cleaned it and still working today,but I have new part in case tighton gas cap code comes on again.

 

this is true...plenty of room without dropping the tank. you can purchase the vent valve on amazon.com for less than $20 including shipping - cured my p0449 code on my 05 silverado, 5.3

 

Well I went to advanced auto parts yesterday and bought the service manual and had them read the code again. Same code P0449. That code is specific to the EVAP canister vent solenoid circuit (per the service manual). I read all 13 pages on this thread and decided I was going to replace that solenoid and the dealership quoted me $151. I found it on Amazon.com for $60 with free shipping. Today the light went out. I think I'm gonna let it ride until the light comes back on. Could it be the weather. It has recently gotten hot here in FL.

 

You may still have to replace the vent valve if it has become contaminated but here is a possible cause to the failure(s)


2007 Chevrolet Tahoe - 2WD | Avalanche, Escalade, Suburban, Tahoe, Yukon (VIN C/K) Service Manual |
Document ID: 2187902
#PIT4347F: SES MIL Evap DTC And/Or Hard To Fill -
keywords emission engine evap evaporative fuel large
leak P0446 P0442 P0455 pressure purge solenoid tank
vacuum vent - (Sep 11, 2008)
This PI was superseded to update model years and provide external fix. Please discard
PIT4347E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some owners may comment that the SES is illuminated and when checking for DTCs the ECM will
have set an Evap DTC. While performing normal diagnostics it may be noticed there is excessive
moisture/water/corrosion at the vent valve solenoid, vent valve pipes, and/or EVAP canister. The
vent valve solenoid draws fresh air from near the top of the fuel filler pipe. In some situations, it is
possible that water spray from the rear wheels may be drawn in though the vent valve pipe at the
top of the fuel filler pipe.
Recommendation/Instructions:
GM engineering is aware of this concern and working on a GM service kit to correct this concern. In
the mean time, the kit can be made from readily available parts and using the following procedure
below:
Parts List
Subject: SES MIL Evap DTC And/Or Hard To Fill
Models: 2007-2009 Cadillac Escalade, ESV, EXT
2007-2009 Chevrolet Avalanche, Suburban, Tahoe
2007-2009 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali
XL
Part
number Description Qty
15844701
evap vent inlet hose ¾" Heater
Hose
1
¾" Heater Hose 2.5" (6.3cm)
98755K24 Inlet Screen 1 ( © 2012 General Motors Corporoabtitoani.n A flrl orimgh tMs rceMsearsveted.r Carr Supply 1-330-
Document ID: 2187902 Page 1 of 5

1. Remove the existing vent hose "mushroom cap" (2) and zip ties (1), as shown below.
2. Add 31" (79mm) to existing snorkel hose using a length of hose taken from P/N 15844701.
Join hose sections together with a 2.5" length of ¾" heater hose, as shown below.
3. Slide inlet screen (98755K24) over the end of the new hose section.
4. Remove Fuel Filler "Sugar Scoop" from vehicle.
5. Add holes to "Sugar scoop" to retain inlet hose, as shown below.
995-5500)
8650K112 Acrylic/PVC sheet material
1 (obtain from McMaster Carr Supply 1-330-
995-5500)
Zip Ties As needed
Document ID: 2187902 Page 2 of 5

6. Fabricate splash shield from Acrylic/PVC sheet material (8650K112), as shown below.
7. 1. 6.645 inches wide
2. 9.75 inches long
3. Use filler "sugar scoop" as template to locate one large hole for fill neck and 3 small holes
for mounting screws.
4. 45 degree cut 1.25" in from corner on each side as shown
5. Use a quart can to mark radius on two corners
8. Attach end of vent hose and screen with zip tie as shown and reassembly with fabricated
Document ID: 2187902 Page 3 of 5

splash shield between "sugar scoop" and fuel filler pipe, as shown.
9. Route new vent hose along fuel filler pipe and add necessary zip tie to retain hose.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition
exhibited is resolved without completing every step, the remaining steps do not need to be
performed.
GM bulletins are intended for use by professional technicians, NOT a
""do-it-yourselfer"". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide
information that could assist in the proper service of a vehicle. WE SUPPORT
Document ID: 2187902 Page 4 of 5

Properly trained technicians have the equipment, tools, safety
instructions, and know-how to do a job properly and safely. If a
condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See your
GM dealer for information on whether your vehicle may benefit from
the information.
VOLUNTARY
TECHNICIAN
CERTIFICATION
Document ID: 2187902 Page 5 of 5

 

final picture to the series

 

Hi, I have a 2006 Suburban 1500 and am getting the gas cap loose light. then after a few more times of that, the engine light goes on. I checked the code and it is PO455.I had it to a shop and they did a smoke test, replaced vent solinoid, and yes my 6th cap !! drove away and 4 days later same thing. Took it back and they said I had a small "dimple " on the edge of the filler pipe, so put on a different cap that was tighter. 3 days later engine light is on. I have about 98000 on my truck and wonder if I need to replace the canister ?? or the solinoid on the engine. Any thoughts ?

 

My 05 tahoe has been having the engine light come on constantly saying it is the gas cap. I took it in and they put the smoke machine on it and it started smoking from the Vapor canister, he showed me and it was alot of smoke. He also said that I need to replace the Fuel Tank Evaporator Control as well as the vapor canister. Should I replace both? if so is this something I should do? the price he gave me was $352.

 

Yes replace both. I did an exhausting search and found the official chevy tech's procedure sheet. It took me (an idiot) about 20 minutes and that includes taking the spare tire out of the way. Tools needed; screwdriver, utility knife. Pick up some 5/8" heater hose - about 8' to reroute the vent to over the top of the transmission and a few zip ties to secure it along the way. It's a quick easy fix you can do yourself and save hundreds.