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Chevy Silverado and GMC Sierra Active Fuel Management Problems



  • Have you called GM?
    Did you buy truck new?
    Have you bought other new GM vehicles in the past?
    Does your truck have AFM?
    Have a dealer inspected the vehicle and confirm the problem and given you an estimate?
  • jframejframe Posts: 5
    I know someone that works there and talked to them. I swapped plugs,plug wires,coils, and injector and I still get a misfire on 6cyl. Took it up to town garage and he checked compression and it was good. But found a bad intake gasket right by 6 cyl. Replaced and still misfire. I think lifter is stuck and building pressure and blowing gasket. It just sucks I bought the truck last nov. and only put 3500 miles on it and now it's out of warranty and I don't have a lot of money to fix it. If I had known there was a problem I wouldn't of bought a newer Chevy. Bad thang is I have a 2007 Tahoe with 100,000 miles and it runs ok.
  • msw007msw007 Posts: 21
    The top end is probably bad and will cost $300-$400 for a teardown to diagnose problem.
    Then another $1500-$2500 to rebuild the top end.
    Let me reiteriate this is a GM desgn flaw. They knew they had a problem and most of the engines (5.3L w/AFM) are out of warranty now. So there attitude is too bad so sad.
    GM has since made changes in the late 2011/2012 model years on these engines to try and remedy the problem. Only time will tell.
    I strongly recommend if you have not had a problem yet to get a tune (such as Blackbear Performance) and turn the AFM off. You will not be sacrificing any fuel economy but you may save your engine.
    We have since traded our Tahoe in for a Honda SUV.
    Good luck to all.
  • jframejframe Posts: 5
    I would like to think if I replace the #6 lifter it would last long enough to get it traded in. I know that's not the right thing to do but I don't have 3000 $ to fix it right.
  • msw007msw007 Posts: 21
    I don't know if you can just replace one lifter. Plus the lifters are all electronic control. So unless you are really mechanically inclined or know someone who is I don't know if I would attempt this.
    I would plead my case to every GM dealer in your area.
    I would contact GM directly.
    I wrote letters to all the big mucky mucks and I actually got a response from an assistant to one of them.
    GM paid for my diagnosis and half the cost of the new engine ($3K) and all the labor for removal and replacing.
    It took a lot of phone calls and letter writing but I finally was satisfied.
  • the whole problem to the afm is the oil pump very bad design. if any body still has there warranty fight for a oil pump, it's the plunger inside the oil pump that gets stuck and sends all your oil pressure back to oil pan so does all the noise make sense now. your engine is starving for oil, which can can cause damage to your internals i changed mine , one on my own on my 07 avalanche and another from the dealer on my 08 silverado both work fine know and every oil change use engine restore for any scaring in the cylinders from no oil pressure.
    good luck to ya'll.
  • i believe in karma gm what comes around goes around you let your customers down.
  • jframejframe Posts: 5
    Well just got oof phone with GM and they are saying that its up to the dealer to goodwill the fix on my truck. The dealer did wave the break down fee to break it down. Ya right. Put said I would need to pay for repairs. If I was over the miles or close to it or over a year out of warranty on years I would not have bothered calling. They know there's a motor problem and don't stand behind it.I have bought about 20 chevys and this will be the last one!
  • msw007msw007 Posts: 21
    I feel your pain.

    I went through the same thing. Luckily I found a dealership willing to go at bat for me and I only had to pay for half the cost of a new motor ($3K).
    They got GM to pickup all the labor for removal and install. The diagnosis etc.

    Yes there is a problem but if it's not safety related they will issue a recall or do anything unless you are still under warranty.

    Calling GM just gets you a mindless minion who has to follow set procedures GM has. They cannot waiver either way on those and they will treat everyone the same.

    Your best bet is to find a dealership who can talk to their GM rep and see what they can do. It doesn't have to be a Chevy dealer it can be any of the GM badges.

    Hope this helps a little.
  • Add me to the list. Been driving GMs for past 25 years. Now for the first time going to look at others. 2007 sierra 4 door 4wd SLT. Paid 40ish for it. 140 k miles. Having the run rough, stabiltrak, check engine light. Took it to the dealer. Code p0300. Misfire. They did a compression test. Cylinder 1no ccompression. Saying they need to tear it apart to see what needs to be done. Suggesting lifter issue. 18 plus hours of labor plus whatever parts. So looking at 2 to 3 k in repairs. They suggested I might want to look at just replacing engine for 5k ish for the warranty that a new engine would bring.

    Yeah right. I have religiously done oil changes every 3k miles. Every service that was called for, aat the dealer. Now it needs 3 k plus of engine work at 140 k miles? It should have gone 200 k plus. I did everything I was supposed to with service.

    I am not putting 3 to 5 k into it at this point. Time to go look at Toyotas
  • jframejframe Posts: 5
    I wish mine had 140k . I wouldn't be as mad as I am now. Yes it should last 200k. I had a 2000 z71 and I got 240k out of it. Like is said GM knows there's a problem. I would be happy if they would pay for the labor and I woild by the parts. And for them to put it on the dealer to decide to help is bs. 53, 000 miles on a motor should not habe to be torn down. I didn't by the truck from the dealer so why would they help even though I drive a car I bought ther and havebought trucks before. I sent another emai to GM saying I wanted to talk to someone higher up then the service rep but they aren't get back to me as quickly as they did before.
  • msw007msw007 Posts: 21
    We ended up with a new remanufatured motor. $3K out of pocket w/warranty 50K miles or 3 years. We also had the AFM turned off with a tune from Blackbear performance. The car was running great.
    Traded it in and got a Honda.
    I feel the same way you do. I will never buy another GM product again unless it's a diesel. Have a duramax since 05 and absolutely love it. Then again the motor is by Izuzu and transmission by Allison.
  • msw007msw007 Posts: 21
    I agree. We had a Suburban with 200K+ miles and another Tahoe with over 180K+ miles and no problems.
    Their new AFM was developed by Microsoft and we were the beta testers :)

    Sending emails will not help. I wrote letters to upper managment (you can find them online w/addresses) registered mail w/return receipt. A minion will then call you and after "they look into it" nothing will happen but try and make you feel good.

    There have been posts about everyone filing complaints with their state's AG office. These actions have worked well in the past with big business. Someone just has to get it orgainized.

    Good luck.
  • chuck1chuck1 Posts: 1,405
    Your going to have a hard time with a lawsuit when GM sells approx. 50,000 units a month (Silverado/Sierra combined) and there have been a handful of problems.

    So you can figure out how many are on the road and how many have issues. But something tells me your going to have a lot of zeros in front of that decimal point!
  • @chuck1

    Your reply does carry weight. However, when there are 40 pages of discussions on Edmunds alone, not evening mentioning all the other forums and you add that to the fact that not one, but two GM service writers and one technician told me its not a matter of if, it's a matter of when these engines will fail. Some happen as early as 50k and some last till 175k. Moving on from that, they tell me if I keep my truck, I WILL be back again with the same problem. They know its a design flaw.
  • chuck1chuck1 Posts: 1,405
    You and I both know some of these trucks go to fleets. Construction, service/repair, etc. The city I live in has a few in their maintenance fleet. They are driven very hard. If they are having issues, those guys are not posting. BTW-if they last 175,000 miles IMHO you got your money's worth. That would be about 10 years or so normal driving habits.
  • chuck1chuck1 Posts: 1,405
    edited August 2013
    Then you need to trade it in on a Toyota! BTW-you will lose the better part of 10grand!
  • Funny you sound exactly like someone in GM's legal department. I see your point, but you are using the obvious to defend your side. 175,000 max....mine lasted 109k (say that out loud...One hundred and nine thousand!!) and I had a repair that cost me $4k. (Now say that out loud...Four thousand dollars) (Now say them together...A four thousand dollar repair at one hundred and nine thousand miles) And two service writers and a tech told me that its possible that the repair may only last me 50k. If it was just my truck...fine I would accept that. But its not. There is no "right" with that. Its an obvious design flaw and they are hiding behind it. There is not anything that anyone can say that will make all of this crap sound ok unless they are trying to use smoke and mirrors to defect blame.
  • your warranty is 5 year 100k warranty. You are on your last year. Take to dealer and make sure they replace all 16 lifters 8 AFM and 8 standard. I'm fighting with my dealer now. They changed only 2 that were bad now I lost 2 more and I'm out of warranty. ALL 16!!!
  • IT'S YOUR LIFTER!!! 1,4,6,7 are your active fuel management lifters. they all need replaced as well as the 8 standard lifters. I did everything you did. The dealer will confirm this or you can do a compression test yourself to confirm, but it is the lifter. REPLACE ALL!!!
  • Well now that all the blather is out of the way, hoping that someone has good info. I have a2007 Sierra. It seems to have a ping when I accelerate.( sounds a lot like the old gas motors when they needed higher octane) Now this only occurs when I'm accelerating slightly OR at the end of the power band just before shifting. I've been told everything to date as to what the problem is. Any suggestions? It's really bad when pulling my small utility trailer. It seem that just that little extra weight it enough to bring it out also.

  • Had my 08 Sierra towed to the dealer after the engine started making a loud clunking sounds, lost power, and the check engine light came on. OnStar said they detected a misfire. Right before this happened there are a clicking sound coming from the engine that changed with the speed of the engine.

    I'm waiting for the dealer to call me this morning with what they have found. I only have 39k miles on the truck. I'm shocked that I'm even having problems with this truck so early. I have an 03 Z71 Suburban with 180k that runs like a top.

    Am I another victim of the AFM gremlins? Any suggestions on how to handle the initial call from the dealership? Thank you to everyone who has posted their stories on this thread.
  • Sounds like you probably are. Are you still under the 5/100 power train warranty? If you are not, STAND FIRM and make them pay for it. I had 120k miles and I got $1200 from them towards the $4000 repair. If the dealer doesn't get it done, call Chevrolet/GM customer service yourself and complain there. Be advised that even after they fix it, the engine is prone to have the same problem again as it is a design flaw....and the next time will be your expense. You may consider getting another truck.
  • Thanks for the advice. The only warranty that is still in force is that 10/120k Special Warranty which I've read is related to a throttle body issue.
  • Dealer just called and said I have a broke rocker arm. He also said he's not sure how that could have happened and that there may be more wrong but can't tell until they fix it.
  • You need to call GM. I may be wrong, but it seems like maybe you are a very calm and good natured person. There is no reason for a rocker arm to break at 38k. They should pay for it and they will if you are demanding enough and if you are too nice they will happily have you pay for it.

    I would get my proof of oil changes together. (call the place you go to and they can provide info if you dont have it) As long as you have that and you have never put a performance chip in it, then there is no reason they shouldnt foot the bill on this.
  • Also...none of my biz, but i did some scouring online with the '08 Silverado rocker arm breaking and that can be caused by a rod or lifter problem. Hence the cam and lifters are what goes out on these trucks due to AFM.
  • No mods of any kind. I do all my own oil changes because I think I use better oil and filters and do a better job.

    I'm going to have an in depth conversation with the service manager. They are familiar with me since my family has bought 4 cars from them over the past 5 years. I'll post the results.
  • I sure hope they help you out. Long-term customer appreciation/retention is just good business. Maybe GM has read some of these posts over the last year and has decided to assist owners of AFM equipped trucks. Be sure to point both your dealer & GM(if you end up contacting them) to this forum. You are not alone.
  • Truck is back without that ticking sounds and runs like normal. I'm going to mail the receipt and letter to GM customer service asking for some assistance with the repair. I think I'm also going to either buy an extended warranty or trade it in.
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