2014 GMC Sierra All Terrain Package with problems

JAC50 · January 28, 2014

I am an FNG on this site but not to GM vehicles or trucks. I traded in my 2008 Chevy LTZ on a 2014 GMC Sierra All Terrain. I am pleased with the comforts of the new truck but having some problems and would like to know if anyone else is experiencing the same.

1. Heat not blowing through floor vent

2. Engine feels like it has a slight miss and fuel mileage has gotten progressively worse.

3. The dealer acts clueless...

The dealer keeps saying they do not think anything is wrong since there is no CEL or codes that show up. Again I am no novice to engines as I am very much a gear head and been a mechanic most of my life automotive, semi and industrial.

With the first item the dealer stated they thought it was a temp switch and when I started questioning the service rep he then changed to the issue being an actuator and pressing him a bit more today he is now saying they are waiting on GM to contact them before he starts into the dash as it is more extensive and that they are not sure what the problem is. Again this sounds more like and issue that the dealer is clueless and hasn't even started checking things out but regardless does not look good for GM.

With issue 2 the miss/stumble in the engine is present at idle, during acceleration and when you reach a cruising speed, I have 6500 miles on the truck and it just does not run as smooth as it did for the first 5k miles and as I have already stated the fuel mileage is crap at best maybe 15-16 highway. Has anyone else seen these problems with their trucks and if so what was done to correct the problems? Anyone have input on dealers in the Toledo Ohio area? Any input is appreciated.

-John

Dnt · February 6, 2014

Hey John I was just up in your neighborhood the other day at the Libbey Glass plant Toledo is a pretty cool little town. I took delivery of a 2014 GMC Sierra SLT Crew Cab Z71 4x4 5.3 with 3.42 rear end on January 17th the build date was 12-11-13. I have driven it approx 2500 miles and it is the smoothest driving truck that I have ever driven.I saw that your post had no answers so just thought I would let you know that I have had zero problems so far but will for sure be watching out and let you know if anything pops up. welcome to the site.

JAC50 · February 25, 2014

Thanks for the reply Darryl and I hope you do not see the same issues that I have. I am far from happy at this point with the way my truck is again I had a 2008 Z71 LTZ before this and absolutely loved the truck not having any issues with it from the day I drove it off the lot. That is what brought me back to GM for another truck but it looks like I will quickly run from this one. As stated in my other posts I love the syling and the comforts of my truck but this vibration has to go. As an FYI I did not have a problem until I hit around 4.5 to - 5K and then I started getting a vibration (actually feels like the valves floating) between 40 and 60 with it being much more pronounced when it goes into V4 mode or when decelerating. At 60 you can feel it in the gas pedal and the steering wheel along with feeling the vibration in the door panels and center console other speeds are mainly in the steering wheel. When you reach highway speeds of 70 or above the vibration fades but as soon as you back off it returns. They balanced the tires the first time and replaced the right front tire the second time but the issue still persists. I have asked to meet with the zone rep and will see what they have to say but if there is no resolve in the near future I will be pushing a direction that GM and the dealership may not want to go. I dont care about the money the truck costs as long as I get the quality that I expect and at 50k I do expect quality.

Dnt · February 26, 2014

I am with you man. I now have 3652 miles and am starting to get some vibration I believe it is from the tires, my truck has the 20" Good (Bad) Year SRA Wranglers I expected them to be rough when they got miles on them and some mileage wear but I was thinking 30 to 40k not at 3 to 4k. If you mainly run highway miles I would be looking at a set of Michelin's I will be pricing a set pretty darn quick if this continues to get worse. Over the years I have run a bunch of different brands and have found the Michelins always provide high mileage and a smooth ride throughout the tread life unlike the majority of tires out there. I traded in a 2009 SLT that had a set of Michelins on it that had over 50k that looked about 1/2 worn and still riding very smooth. I had thrown the OEM Bridgestones away at around 30k after spending a small fortune on rebalancing/alignment efforts. Bad tires can make a good truck drive like crap no doubt. Same thing on my 2006 Silvy I thought the truck had a bad front bearing or something (it was that bad) I had the tires balanced rotated several times multiple alignment checks etc it was just the stupid OEM tires, these were tossed at less than 30k I cannot remember what brand they were but they were crap the front tires had little cups in the outside edges the Michelins never did that on any vehicle that I have ever put them on. I put up with chitty ride quality way too long with that truck that is where I learned my tire lesson at LOL

Gmcclanks · March 12, 2014

Hey I have an all terrain with 5000k miles on it and i have had similar issues with vibrations and clunking sounds intermittent in the transmission. It vibrates in the 6th gear and up shifts hard. I have also heard some sort of noise coming from my left front wheel area. I have taken it to the dealer now twice and have even taken the tech on a ride and he told me that something is not right but it will need to get worse before he can figure what the problem is. I told him to recalibrate the computer and he wouldn't because there wasn't an update. Have you learned anything new about your truck yet?

bdbake01 · March 12, 2014

I am with you man. I now have 3652 miles and am starting to get some vibration I believe it is from the tires, my truck has the 20" Good (Bad) Year SRA Wranglers I expected them to be rough when they got miles on them and some mileage wear but I was thinking 30 to 40k not at 3 to 4k. If you mainly run highway miles I would be looking at a set of Michelin's I will be pricing a set pretty darn quick if this continues to get worse. Over the years I have run a bunch of different brands and have found the Michelins always provide high mileage and a smooth ride throughout the tread life unlike the majority of tires out there. I traded in a 2009 SLT that had a set of Michelins on it that had over 50k that looked about 1/2 worn and still riding very smooth. I had thrown the OEM Bridgestones away at around 30k after spending a small fortune on rebalancing/alignment efforts. Bad tires can make a good truck drive like crap no doubt. Same thing on my 2006 Silvy I thought the truck had a bad front bearing or something (it was that bad) I had the tires balanced rotated several times multiple alignment checks etc it was just the stupid OEM tires, these were tossed at less than 30k I cannot remember what brand they were but they were crap the front tires had little cups in the outside edges the Michelins never did that on any vehicle that I have ever put them on. I put up with chitty ride quality way too long with that truck that is where I learned my tire lesson at LOL

I'll have to second this. I just sold my '01 Dakota in favor of a '14 AT. The Dak came w/ Goodyear Wrangler's (on a side note, Goodyear must court these OEM's haaaard. No other possible excuse for such a POS tire on a new vehicle, and it happens all too often). By 20K, the wranglers were absolutely trash. I had THREE, count 'em, THREE tire shops tell me "These tires cannot be balanced". They were right. As soon as I could muster the cash I bought a set of Michelin LTX's. 90K of HARD miles later...baby smooth. 85K on second set, STILL SMOOTH!!! I didn't even bother to rotate that often. These tires are freakin awesome. Worth. Every. Penny. As for on/off road? I'll put them up against just about anything else within reason. My back yard is affectionaly referred to as "Buckner Swamp" by my co-workers. 1-Because it's located in Buckner, and 2-Because it's a swamp. 365 days a year. We've buried Fords, Chevy's, Dodge's, Nissan's AND Toyo's in the backyard on multiple occasions. Usually because somebody wants to borrow my trailer and shows up il-equipped LOL. Without fail, the Dak w/ the Michelin's pulled them out without breaking a sweat. Sometimes in 2wd just to rub salt in the wound. Once, I KID YOU NOT, in 2wd pulling the buried truck AND THE TRAILER out. I got pics.

Long story short, you probably have some issues beyond tires. But the tires don't help.

MotoMedic · March 12, 2014

I am an FNG on this site but not to GM vehicles or trucks. I traded in my 2008 Chevy LTZ on a 2014 GMC Sierra All Terrain. I am pleased with the comforts of the new truck but having some problems and would like to know if anyone else is experiencing the same.

1. Heat not blowing through floor vent

2. Engine feels like it has a slight miss and fuel mileage has gotten progressively worse.

3. The dealer acts clueless...

The dealer keeps saying they do not think anything is wrong since there is no CEL or codes that show up. Again I am no novice to engines as I am very much a gear head and been a mechanic most of my life automotive, semi and industrial.

With the first item the dealer stated they thought it was a temp switch and when I started questioning the service rep he then changed to the issue being an actuator and pressing him a bit more today he is now saying they are waiting on GM to contact them before he starts into the dash as it is more extensive and that they are not sure what the problem is. Again this sounds more like and issue that the dealer is clueless and hasn't even started checking things out but regardless does not look good for GM.

With issue 2 the miss/stumble in the engine is present at idle, during acceleration and when you reach a cruising speed, I have 6500 miles on the truck and it just does not run as smooth as it did for the first 5k miles and as I have already stated the fuel mileage is crap at best maybe 15-16 highway. Has anyone else seen these problems with their trucks and if so what was done to correct the problems? Anyone have input on dealers in the Toledo Ohio area? Any input is appreciated.

-John

http://www.gm-trucks.com/forums/topic/157915-2014-sub-forums-please-read/

fondupot · March 12, 2014

I had a problem with misfiring and stumbling. Had it towed to the dealership. They opened up the coil pack and spark plug wires and found that the connections were bare bone dry. There should be dielectric grease in ALL the fittings to aid in spark and keep water out. If water gets in ther it could cause an issue where the spark does not go through it correctly, and cause a misfire.

The dealership replaced some of the wires and put the grease in all the connections. haven't had an issue since.

Disconnect one of you spark plug connectors and check out to see if there is grease in there. If its dry, you might have found the issue.

GMCustomerService · March 12, 2014

Hello JAC50,

We are sorry to hear of the concerns you are experiencing with your 2014 GMC Sierra. I would like to look further into these concerns. If you'd like my assistance please send me a private message referencing this thread.

I look forward to hearing from you.

Andraya R.

GM Customer Care

JAC50 · March 22, 2014

Hello All,

So as promised here is my update, Went to the dealer (Ed Schmidt Perrysburg Ohio) to pick up my truck after being told it was done, well lets just say the warm water on my leg was not rain... (for those that cant read between the lines don't p!$$ on my leg and tell me its raining)

I was told there was still at vibration at 45 but that it was very slight and that it is the best they can do. Well I decided before I would accept I would take the truck for a ride and see what it was like. As soon as I headed down the road the truck sounded a little louder than normal and the vibration seemed like it was gone but something just did not feel right. I went about ten miles and did not like what I felt so took it back to the shop but was contemplating taking the truck back home with me... Well that was until I decided to go under the truck and take a look for myself and at that point lets just say I quickly saw red and my temper was about as long as my... I think you get the point yep the point of the same thing GM is trying to give me. What I found was they had used hose clamps (worm gear clamps to be more specific) to try and balance the drive shaft that was installed the previous week. Well with that lets just say any education went out the window and I changed to a vernacular that I am sure would make most bikers blush yes I was mad and my patience and frustration level hit its breaking point. When I left the dealership things were open ended as I am done dealing with ignorance and incompetence and want to talk with someone in charge. I have asked GM customer care to contact me before COB on Tuesday or my next step is contacting an attorney and following Lemon Law proceedings BTW this is consecutive day 23 and approximately 34 days of the past 60 in the shop. I know I will have a battle but luckily for me I have the means to fight and the heart and tenacity of a pit bull to win even if it turns out to be a pyrrhic war at least they (GM) will understand that people will not put up with second rate quality while paying a premium price. Check out the pics I have added to my profile and you can see for yourselves as a picture is worth a thousand words.

Good luck to all and will let you know how things turn out.

John C.

JAC50 · March 22, 2014

JAC50 · March 22, 2014

JAC50 · March 22, 2014

For those that have to see it to believe it....

jay15892 · March 22, 2014

Yeah I agree with you. That is not a professional fix.

Sent from my iPhone using Tapatalk

Dnt · March 22, 2014

Which Dealer did this? If GM really has people monitoring this site they need to check into this!! Next thing you know they will be using spray foam from Home Depot sprayed into the dash to stop the rattles LOL. Here is probably a normal everyday conversation at this dealerships service department..Now my currsin had a race cur wheres he balanced that thar driveshaft with some worm gare clamps from Home Deppie sture. Homer run over thar and pick us up a few wrigth quick. Oh and we will fix up that thar dash rattle also Git That Thar can of spray Foamer boy and we will Fix this Thang good. These dumb ole buyers of these 50k pickum up trucks will never noo da dafferance, heck w we are twiced as smurt as dem.............. Oh and call Larry The Cable Guy I think my TV might be out and I do not want to miss the next epersode of vivor.