Question about GMC Sierra 1500
These are very common codes. Code P0499 is for the EVAP Canister Vent Control Solenoid circuit and Code P0455 indicates that there is a large leak in your EVAP system. Chances are VERY LIKELY that the leak is being caused by the vent control solenoid being stuck open. If this is the case, repairing what is wrong with the Vent Control Solenoid has a very good chance of fixing BOTH codes.
There is a Technical Service Bulletin (TSB) for your vehicle that applies to code P0455:
TSB REFERENCE NUMBER 02-06-04-037I (NOTE: That last digit is an "I" not a "1")
The vent control solenoid fails due to water, dirt and debris entering the solenoid through the vent filter. This TSB involves replacing the vent control solenoid and installing a long section of heater hose to the vent filter and relocating it away from the underside of the vehicle. I usually use about 8 feet of hose and tie the filter unit to the brace under the hood next to the brake booster. It is not very hard to do. The hardest part is disconnecting the electrical connector from the original solenoid - it is not very easy to get your hands in there.
The kit is available from any parts store that carries AC Delco parts. The kit comes with everything you need except the heater hose and wire ties to secure it.
The part number for the kit is: 19152349
I have also had a couple of them where the wiring harness has rubbed against the underside pinch-weld area of the left rear of the cab, causing the code P0449 When you install the new service kit, be sure to inspect the wiring harness to the solenoid connector for damage here.
Posted on May 22, 2011
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Apr 08, 2017 | Cars & Trucks
Jan 30, 2017 | Cars & Trucks
Sep 19, 2016 | Cars & Trucks
Mar 20, 2016 | 2006 Buick LaCrosse
Jan 28, 2016 | 1998 Ford Explorer
Jan 28, 2016 | Cars & Trucks
Jan 07, 2016 | 2004 Chevrolet Chevrolet Impala
Apr 23, 2011 | 2008 GMC Envoy
Mar 01, 2010 | 2006 GMC Sierra
1,362 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: