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2011 Silverado, POOR mileage, surging, no check engine light

24

Comments

  • I too have had noting but trouble with the service from GM dealers, a gm engineer and all the way up to gm's main office.
    If the dealer can't find a trouble code, then you just think there is a problem when there really is not a problem, in their opinion. The trouble code gives them a justifiable way to keep from spending time troubleshooting the problem. I really don't think they know how to do it otherwise. Good luck with ALL the GM service assistants. They are really just pacifying you and trying to make you feel like they are trying to help with YOUR problem. When all is said and done, all they do is call the dealer where you had your truck looked at, and report back to you that the dealer was right. My problem was with the Active Fuel Management system not working at normal highway speed. It shows on the DIC gauge that it is not working, but they insist that it is working normally. If I don't want to void my warranty, i'm stuck with waiting until it expires before I can have an after market computer program installed to correct the problem. My 2011 Silverado now has 4600 miles. 93,400 miles to go at 16 MPG on level highway..
  • chuck1chuck1 Posts: 1,405
    "My 2011 Silverado now has 4600 miles. 93,400 miles to go at 16 MPG on level highway.. "

    How fast are you going?
  • string2string2 Posts: 71
    edited December 2011
    "My 2011 Silverado now has 4600 miles. 93,400 miles to go at 16 MPG on level highway.. "

    How fast are you going?

    Between 60 & 70 mph - actually, slower than normal open highway speed. On level ground, not pulling or hauling, plenty air in tires and not windy. Seems like thay wouldn't build them with those restrictions? Well, its only money.... lots of it!
  • chuck1chuck1 Posts: 1,405
    Your AFM should be coming on at least part of the time under those conditions. It will not come on much once you hit 75.
  • string2string2 Posts: 71
    edited December 2011
    Your AFM should be coming on at least part of the time under those conditions. It will not come on much once you hit 75.

    I think so too! But GM tells me it is working normal, dispite what other drivers and the specs say.

    It will work for short distances at around 62-63 MPH, but under those same ideal conditions and I don't have the air conditioner on. With the air on, it quits working around 58 - 60 MPH. I'm hoping it will get better, but it seems like it should be broke in by now with 4,600 miles.
  • My issues started with my first visit to the service dept with about 5 minor concerns (mileage, sputtering and brakes included) One of the concerns was a cut in the dash (trim over the top of insturments) and I asked the service writer to, 1- replace it if is a seperate part, or 2 DO NOT replace if it is only serviced with dash assy. I told it was part of dash. Another concern was the radio. The aux port on the front of the radio was loose (plugged ipod in and got terrible static and feedback when touching brakes) among a few other things.

    I sat in the service drive with the writer and demonstrated all items on my list at the time of drop off, made a detailed list and gave it to the writer (just to help) I was told a week earlier that a loaner would be waiting for me at drop off. Well nope I couldn't get one unless they were sure it would be there over night. Ok could have told me this a week earlier and I would be fine with it. I asked to please notify me asap if they had to keep the truck so I could get a way to the dealer after work (5pm quitting time) no calls no nothing, I called and was told "oh yeah ummmm we will not be done today (5:05 pm) come and get your loaner" Hmmmm how am I to get there?

    When I went in to pick up the next day, I asked if I got a copy of the work order (what they found, what was done ect.) No it will be mailed to me. I got in my truck to leave, Now my radio does not play out of lt speakers, went back and asked whats up with that? I was told that there was no prob found with radio.

    The brakes still pulsated, radio didnt work, dash wasn't repaired, Oh yeah Did I mention that I an ASE certified and I-CAR certified? I have been not only a heavy collision repair tech. but I am also an A/C, Suspension & brake, Electrical specialist. I now am a service writter / estimator at a large Independant body shop, Oh by the waythe dash part WAS a seperate part, I pointed this out to the writer and he ordered the part, I called to check on the part (is it in yet?) after 2 weeks I was told the part was not in yet 8/11/11, I called parts dept for work related orders and I was asked if I was ever going to have part installed because if not they would have to send it back (only able to keep warranty part for so long)

    Theres FAR more than these issues, I could go on and on. But this final note..... After 4 weeks of this I HAND DELIVERED my reply to the "Are you satisfied with our service letter" explaining why My answer would be no, Which includes all the above and the derogitory comments the writer had made when he didn't know I was behind him, to the Service director (9 pages) I still have not gotten so much as a BITE ME from anyone. Why? the Directors son, Is the service writer. I'm getting mad all over again!

    Yes Sarah I will resend my info to you when I return to work on 12/19. but as you will see in the letter I sent (the reply to your first reply) I am not so sure I want to deal with the same dealership.

    Thank You
    Dennis L Steinhart
  • Hi, I was considering a Silverado for my next purchase, what size motor and do you think the crew cab cuts the miles per gallon a lot?
  • I have the 5.3-2011 crew cab and get between 13 and 14 stop and go city. I have also achieved between 18 and 20 mpg highway depending on speed. It gets best mpg at no greater than 70mph.

    Remember these things weigh 5,000 pounds and are shaped like a refrigerator, not the best for mpg.
  • I'd be satisfied with that! That sure is a lot better than 16 MPG at 70 MPH.
  • String,
    We are all aware that your truck is an exception and having issues. Thank you for once again reminding us of the terrible mpg you are getting with your truck. Your truck is an exception of not hitting the "high teens" on the highway.

    Shack - these trucks are great values right now and there are deals to be had.
    Good luck!
  • String,
    We are all aware that your truck is an exception and having issues. Thank you for once again reminding us of the terrible mpg you are getting with your truck. Your truck is an exception of not hitting the "high teens" on the highway.
    Chuck
    ====================================================
    I'm glad to see that you and the other regulars here have been throughly saturated with my complaints about my poor gas mileage and "Active Fuel Management" problems that can't be corrected. I guess most people do feel like, problems are not really problems, as long as they are not their problems.

    But i'm really wanting to let the new readers know how GM takes care of their customers when there is a problem they can't identify.
    According to GM, my gas & AFM troubles are not issues. They say it's operating normal if there is no trouble code (no matter what). You bought it! get use to it! sell it, if you can...leave us alone!
    String
  • But i'm really wanting to let the new readers know how GM takes care of their customers when there is a problem they can't identify.-quote.

    Ok, it is a help to be reminded. My cousin and his brother both big wheels in GM but gave me no help with my 04 Saturn issue neither can they help me find a job. They have no time for the little people. I still am going to buy American. They don't help me with any discounts either. I know of a certain person with a Yukon Suburban 374,000 miles and still running strong so that says a lot. I am seriously considering the Silverado with the 5.3 or 5.8 and I know that I will never return to the dealer except to trade it in after 20 years. I lke to read of all these issues and put it all together, I don't care for big advertisements but would rather sit in the complaint dept and take notes. Thanks for your venting and give me more.
  • In your own opinion what would be in store for me, if to purchase a brand new Silverado 5.3L with reg cab? MPG, odometer reading when I drop off at the junkyard and how many years of service? I change oil (Mobil 1) every 3000 miles, good maint and I don't tow any thing, driving on good roads (not Michigan). Spaztikhi, Chuck1919, and String2, Servicetech and anybody else-all of your comments I value.
  • In your own opinion what would be in store for me, if to purchase a brand new Silverado 5.3L with reg cab? MPG, odometer reading when I drop off at the junkyard and how many years of service? I change oil (Mobil 1) every 3000 miles, good maint and I don't tow any thing, driving on good roads (not Michigan).
    ====================================================
    Shack4tom,
    Sorry, I can't give you any first hand advice on the 5.3 engines, other than what I've read. My opinion (guess) is that you should get 250 - 300,000 miles out of it. If the one you buy has a properly operating " Active Fuel Management " system, you probably wil get good service out of the truck. If you won't be pulling anything with it though, you might want to check on one with the 3.08 rear end. It might get you a little better gas mileage. These trucks pull strong and seem to be built solid. I would be very satisified with mine if the Active Fuel Management system would work properly. Because of that, I only get about 16 MPH on the road, and they tell me it can't be fixed. Others posting on this site say they get close to 20 MPG. Good luck!
    String
  • The truck only has 3000 miles on it. I was told that if I wanted to bypass the AFM system to shift into manual mode and select the 5th gear and see the mileage that way. I tried this and found that 5th was too low and the RPM's stayed too high. I tried 6th in manual mode and the mileage was just as bad (13.4 hwy). I guess with the way it shifts so badly, terrible mileage and fluctuating idle, I need to paint it like a lemon and put sunkist stickers all over it. In the back window warn other potential buyers of the problems that GM will not correct.
  • chuck1chuck1 Posts: 1,405
    edited January 2012
    Here is another post that yet needs clarification. First off, 3,000 miles is way too early to start measuring mpg. When I got my truck the first 5,000 miles the city mpg was really bad, and then got better.

    The truck DOES NOT REV much higher in 5th than 6th. I keep mine in 5th in city driving. NO reason to have the truck shift to V4 for a very short distance. In addition, the trucks transmission needs to "learn" your driving style.

    The truck does not have the smoothest transmission on the market, but you have a 100,000 mile power train warranty should the transmission go out.

    The Toyota has bed bounce, the Dodge Hemi sucks gas, and there has been a few blown turbos on the Ford Eco boost. Take your pick which one you should have bought.
  • string2string2 Posts: 71
    edited January 2012
    Hi fp2tall
    I'm glad to see i'm not the only one with this problem. Maybe if more people with "Active fuel Management" problems would post their problems on this site, GM might actually start believing their really is a problem! Mine has over 5000 miles and it's not any better at all.
    Thanks for your input.
    String
  • smurf57smurf57 Posts: 1
    Purchased a new 2011 Silverado 02/03/2012 now have 66xx miles have had to dealer twice this week for poor mileage, (has always been bad but read posts and gave it time to break in). I averaged 14.6 mpg on the truck on a trip from Marble Hill, Mo to Corpus Cristi, TX and return.The service manager has done 2 "fuel Efficiency tests" (@70 mph) first one was 15.2 mpg second one was 15.0 . The truck is throwing no codes so GM says nothing is wrong, GM suggested I take off bug shield, which I did today (which according to GM the bug shield is changing the aerodynamics of the truck causing the bad mileage), I am supposed to take truck back to dealer Monday 04/02/2012. I just wish GM would man up and fix the problem.
  • gmcustsvcsarahgmcustsvcsarah Posts: 1,964
    I'm sorry to read that you are not 100% satisfied with your Silverado at the moment, smurv57. Looking forward to hearing how your visit to the dealership goes today.

    All the best,
    Sarah
    GM Customer Service
  • string2string2 Posts: 71
    I've had the same problem as you since day one on my 2011 Crew Cab Silverado 5.3 six speed trans. My advise to you is, try not let one of GM's engineers look at your vehicle. He will only confirm that there are no detectable trouble codes. That info will then be tagged to your VIN number. Once that happens, none of the dealerships will check your truck without getting GM approval. GM will then deny there is a problem and refuse to do anything related to that problem because there is no trouble code. This lets everybody off the hook, except you, holding the bag! Effectively, that voids your warranty as far as anything related to that problem, sneaky huh!. If you look at your Inst. fuel economy (DIC gauge) , most likely you will see that your engine's "Active Fuel Management" is not working at normal highway driving speed (around 70 MPH, when most needed). That is where you can see when the engine changes from v8 to v4 mode (that does not trip a trouble code when not working correctly). I have read that ithis is mostly a problem with the 5.3 Vortec engines with the six speed transmissions. I think if GM wanted to fix the problem, they would recalibrate the vehicle computers for that model truck. Good luck! Just wait till you hear all the ridiculous excuses they give you.
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