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My truck won't pass emissions. It shows "not ready" for the Evap system, catalyst, and an o2 sensor. I drove it for about 500 miles between tests. I got looking at the vehicles history and it looks like the "not ready" issue has been ongoing for this truck? Any ideas?

2015 GMC Sierra. 60k miles. Crew cab, short bed. Got a P0445 2 weeks ago on a road trip for the holidays. Cleared it, it came back immediately, drove it back ~1000 miles no issues just bad mileage. Now I'm getting a P0449. After getting under the truck I realized the wires going to the evap solenoid are torn up. How? Why? I'm not sure. So, I'm attempting to splice them back together before replacing the solenoid but cannot get the plug off for the life of me. I've attached photos of the wires and the plug/connector. I've tried pulling Part B straight down, away, up, etc- and it doesn't budge. I've tried prying Part A out (away from the wires) and it doesn't budge either. I've also tried pushing in the red tab between the split in Part A but that also doesn't budge. Can anyone help me figure out what to do here? Is my pin/connector broken? Thanks in advance...

Hello guys, this has probably come up a million times but my 2005 silverado 1500 with the 5.3L has a p0446 EVAP code. Its for a vent control circuit malfunction. I have done a ton of research and have replaced a few parts so far including the vent valve, fuel cap, and fuel tank pressure sensor. WHAT else can it be!! The only symptoms I notice that could be a clue is every now and then when I begin fuelling, the pump stops like 4 or 5 times and then pumps steady to fill up. Could this be a sign of a bad canister? I'm not sure if anyone has any idea let me know, I got to pass emissions in February. Thanks!

My 2000 Silverado has an issue with the evap system that is causing the P0449 trouble code. I've watched several videos and it looks kind of simple to fix the issue, except my truck seems to be different. Most videos show a small canister behind the fuel tank. Mine however has a larger canister in front of the tank - I think. Am I looking at the right thing? Two fuel lines seem to go to it. A mechanic said the truck had to be upgraded to fix the trouble code - apparently the old parts are no longer available. I'm wondering if old parts might be available via Ebay, Amazon, etc - things he can't do (because he has to warranty his work) but as the owner I might be willing to do. Am I even looking in the right place?

Short novel coming.. my 2006 Silverado was throwing 0499 code so replaced fuel cap, purge and valve solenoids.. check engine light still on. Didn’t bother checking power of course, took her to the stealership and $220 later found out that the system wasn’t getting juice. The fuse was fine, but the fuse terminal in the fuse box was loose or faulty so was only getting intermittent power. They told me they did a “temp fix” to it but that if the light came back on i might need a new fuse box. Sure enough next day the light comes back on.. How hard is it to replace a fuse terminal? Honestly I’m having trouble even figuring out how to remove the fuse box itself, looks different than all the ones I’ve seen on YouTube. Should any old mechanic be able to do this or do i need to take her back to the dealership? Do i need to replace the ENTIRE fuse box? Thanks..

2017 Sierra 5.3 4x4 crew cab short bed. So I had a Rhino liner sprayed in my truck yesterday, and when I picked up the truck the CEL was on for the first time since I’ve owned it. It was pouring rain and I was in a hurry to get back to work, so I figured I’d deal with it later, and maybe they unplugged something or let the battery drain. Light stayed on back to work and again on the way home. Checked the codes and it had a p0449 and another one for throttle position, but drove fine. Reset the codes and drove to work today with no CEL. Remote start wouldn’t work when I left work, and sure enough it was back, but just the p0449 this time. I checked all of the hoses, wiring, and what I could see of the tank and etc but I see no problems. The solenoid is under the cab and not near the bed, so any ideas if they could have jacked something up when prepping or spraying? Truck is under warranty but I don’t want to pay $100 for GM to say that Rhino folks messed something up and it’s not covered under warranty, but don’t want to harass the bedliner guys if it truly was a coincidence and not related to anything they did. Thoughts?

Good morning All, I have an 05 Sierra 2500HD, 6.0, 4x4, Automatic, with 170k miles. Back in march I had to replace the engine with an ATK reman. The bottom end was going out. I also replaced a great many peripheral parts at the same time. *Intake Manifold, Evap purge valve solenoid, Purge valve hose. vent valve and solenoid, evap tank, gas cap (all genuine gm parts) I cannot rid myself of code p0443, I feel like I have read 1000 posts on the subject, and nearly all, have not reached any resolution. I need to sell my truck, but with this code ever present, it makes it difficult. the truck starts fine, idles at 600 rpms, but has a decided shudder from 1500 to 2500 rpms. Seems to have lots of power, no extraneous gas smells. no hesitation. Just that stupid code. I just ordered and installed another purge valve solenoid, cleared the code, started it up again, and without hesitation, the cel came on again. My frustration lies in the fact that most all the system is brand new (gm Parts) can anyone help.....Pleeeeaaase...... I personally don't believe the evap systems are a conspiracy to destroy the free world. (sorry)

Hello, I recently bought a 2000 GMC Sierra 2500 extended cab SLT 2wd with the 5.3L. I was very excited about this truck initially as I got it at a great price, but I am starting to become overwhelmed with all of its problems I recently discovered. The previous owner purchased this truck at an auction, and put a lot of new parts on it mechanically and cosmetically. There are a lot of mis-matched parts on this truck and I can tell it is somewhat of a "Frankenstein." One thing I noticed is that there are 4x4 buttons on the dash, even though this is a 2wd truck (no T-case). So obviously someone put a new dash on from a 4wd donor. Also, the plastic around the ignition cylinder looks like its been monkeyed with, so someone was probably fooling around near the steering column. When I test drove the truck, the only light on was "Service Engine Soon." However, when I brought my truck to get an OBDII scan at the parts store it returned 14 codes (some duplicates) which are as follows: B0017 - Passenger frontal deployment loop open B0024 - Driver deployment loop short to ground B0036 - Discriminating sensor open or short to voltage B0051 - Deployment commanded C0265 - EBCM relay circuit P0430 - Catalyst system - Low efficiency (Bank 2) P0440 - EVAP system P0449 - Evaporative canister vent solenoid control circuit But, NO lights are ever on the dash except the SES. Shouldn't the airbag or SRS light be on as well? On startup the only lights that come are the SES, nothing else. All the gauges work, although they bounce oddly when I shut off the truck. The voltage needle also twitches very slightly when I use the turn signal. Also, when I turn on the headlamps, the only thing lit up is the cluster. The radio, climate controls, and everything else is dark. And, when I cleared the codes with the ODBII scanner, the radio went off and reset itself to 1:00?! I have literally spent hours on end searching in vain for a definitive answer to this host of problems with only little success. I am guessing that the "B" codes mean that I need a new SDM? Perhaps this truck was in a wreck? P0430 might be because of a small exhaust leak this truck has, or possibly the cat is bad. P0440 and P0449 might mean I need a new EVAP solenoid or can? Please help me, it would be greatly appreciated. This truck means a lot to my little family as it is how we are getting across the country for my new job in Tallahassee. Any insights would be very welcome. Thank you all.

I'm posting this in a few different Chevy forums in the hopes of getting our story heard and getting some kind of useful advice or even just feedback. So I apologize if you have already seen this somewhere else. So I'll TRY and keep this to somewhat of a minimum, but no promises. Thanks for reading all the way through if you do. I just need some feedback and/or advice. My husband and I went down to our local Chevy Dealership and traded in our old worn out 03' Dodge Ram on 12/20/16 for a 1 owner 2008 Chevy Silverado 1500 and paid a little over $16k. LOVE this truck. It's gorgeous, all the fancy bells and whistles, (On-Star, XM, remote start, tonneau cover, etc.), seems very well taken care of, and doesn't have super low miles but seems about average for an 08'. The previous owner had bought the truck brand new in 2008 from this Chevy Dealership and had brought his truck for ANY service to this dealership. So they had all the service records. So we felt good about that. When we bought the truck, we were obviously aware of the current recall on the Takata airbag inflaters and it hasn't been fixed yet, obviously. The truck did have a light on for the airbag and the Chevy Dealership told us it was for the SDM Airbag Module. They said they would not be fixing that because there is no current recall for the SDM module in this truck. And he's right, there isn't. I searched the VIN on GM and no recall for the SDM module. So with that being the only issue (besides the Takata inflators) we decided to buy the truck. Here is what has happened since the night of 12/20/16. When my husband was signing all the paperwork for the truck, it also included signing up for On-Star which was done right in the office. As my husband started his drive home with his new truck, he got an email from On-Star for his new account about 5 minutes or so after he left the dealership. As most of you probably know, On-Star does diagnostics on any vehicle they have in their system and will send the account holder a report of their diagnostic check. So he read his diagnostics report and it indicated that there was an issue with the trucks emissions. That was all it said. Something we were not told about by the dealership and at this point in time there was NO check engine light on the truck. Our salesman was out of the office the following day, Wed. 12/21, so we couldn't get a hold of him until Thursday. Late Wednesday night I tried to remote start the truck and it wouldn't start with the FOB (remote start will not work with the CEL active). We started the truck with the key and that's when we noticed the check engine light. Not even 48 hours after we purchased the truck. We called On-Star and they told us the code is P0430 which is Catalyst System Low Efficiency Bank 2. Which is an O2 sensor or the cat. When we called the dealership and told them what was going on, it took them at least a week to get the service manager to call us back and get the truck in to test the code. OK so took the truck down to the dealership, service manager tested the code and came back out and told us it read as the EVAP Vent Solenoid and that the valve flap was stuck open and causing a vacuum leak. Told us that we should have been smelling gas fumes. No we have not. At all. Never had a problem with ANY fuel issues at all. Of course we thought that sounded a little odd. My husband is not an idiot when it comes to vehicles and from what we've researched online, P0430 is a VERY specific code to the catalyst system. But of course we TRUSTED the dealership and their service manager. Maybe they knew something that we didn't about Chevy codes. So they said they would call us to schedule an appointment to have it fixed. About a week later (this past Thursday 1/5/17), we took it in to get fixed and we drove away with our loaner. Next day, we pick up the truck, service manager said they replaced the solenoid and the check engine light was off. He also told us that the problematic EVAP Vent Solenoid they replaced had no power to it and that when they took it off, the wires were crossed. How the hell does that happen..? Obviously wires don't just cross on their own. So it must have been replaced in the past by some dingle berry that couldn't figure out where the wires go and the dealership didn't have any service records on the truck for replacing the EVAP vent sol. OR that was just a flat out lie. We were past thinking this was odd. At this point, everything that had happened since we traded in our Dodge for this truck and they only gave us $100 for our Dodge to refusing to replace the SDM module to the back door locks working intermittently after a couple days to giving us the run around about getting it in to get fixed to shotty service records about not knowing if the SDM module had or had not been replaced even though they had records that the previous owner had brought it in at least 3 separate time because of the SDM module light..honestly, I never felt good about this deal when they only offered us $100 for our Dodge. It was a worn out work truck but it was worth way more than that. I didn't want to do it. I never felt good about it and always felt like we were being played. But it was my husbands truck, I wasn't there when he bought the Chevy so it wasn't my choice. I trust my husbands judgment 100%. FAST FORWARD TO TODAY 1/10/17. The truck had been in the shop this past Thursday and Friday. It is now Tuesday and my husband was out in the truck and called me to tell me THE CHECK ENGINE LIGHT CAME BACK ON! He called On-Star and SURE ENOUGH, it's P0430. Same. Exact. Code. Hence the title I wanna drive the damn truck through the front of the effing dealership. He has called the Dealership about 5 times already and of course, no one is available. Not our salesman or anyone in the service department. Go figure. Only thing to keep in mind is we bought this truck USED and was classified as AS-IS sale. We knew that and were fully aware. BUT we are 100% certain that the definition of AS-IS does not include them make us FALSELY believe that the truck did not have an emissions problem, or ANY problem other than the SDM module. They specifically told us the only issue the truck has is the SDM module. The way this has worked out (On-Star emailing the diagnostic report literally 5 minutes after leaving the dealership, the code was already in their system) they HAD to have reset the check engine light on the truck probably when they brought it around for my husband to test drive it. They did not disclose that to us. They led us to believe the truck was in GREAT working condition and had we known about the emissions problem, we could have better a BETTER more ACCURATE decision on buying this truck. Or we could have negotiated the price and getting it fixed before deciding if we still wanted to buy it. They disclosed everything except for this emissions problem and the back door locks. And NOW even after they said they "fixed" it, the check engine light is back on which makes me think they just fed us a bunch of BS and they just reset the CEL light again to shut us up and stall us until we can no longer return the truck, imho. Buying AS-IS means you know EXACTLY what you are getting. We were deceived. Hands down 100% I believe they were completely deceptive and knew exactly what they were doing when they sold us this truck. So I'm not really sure if I actually have a question. At this point, my husband is already getting the phone numbers for Wells Fargo, our financier, for GM Corporate offices or complaint department who ever we need to call there, for the Attorney General of PA, and whoever else we need to contact. Unfortunately, they aren't BBB accredited so that's not an option. Any ideas, Thoughts, advice, similar stories, feedback for me?? Anything would help us figure out what we are going to do. Sorry it's SO long but THANK YOU so much for anyone that actually read the whole thing and is willing to give me some kind of feedback. Much appreciated!!

Hello i am new here so i wanted to start by thanking everyone that may look at this post. i have a 2012 Silverado 1500 5.3 4x4 crew cab with 38K on it. the truck i like brand new and i have owned it for 5 months. well now that winter has hit i started getting a p0446 error code. i have read tons off forums on the topic and have tried all of the normal cleaning of the filter, checking connection, blowing out and testing the control valve. i have read one topic about water intrusion causing this and i believe that is my problem. the last time i cleared the code we had over a week of dry cold weather and no code appeared. well the last two days it has been raining hard and when i remote started my truck this morning it ran for about 2 minutes and shut down. the code came back. it has only ever set the code while running in remote start and when it is raining. so my question if this is a water problem were should i be looking for the short? the truck sits outside as it is to big for my garage. Thanks in advance for any help!

I recently self - installed a Whipple sc on my 2014 sierra. A couple days after i finished the install, the engine light came on and read a code saying the EVAP valve EVAP flow during a non-purge condition. I was wondering if anyone had the same experience, knew of anyone who did, how and/or why it is happening, and what actions i could do to fix it.