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Chevy Silverado and GMC Sierra Undercarriage Rust



  • cmannscmanns Posts: 1
    Please help. I bought an 08 GMC Sierra a year ago from a chevy dealership. It is now turning into a rust bucket. I have no idea what to do. I did purchase an extended bumper to bumper warranty. Any info appreciated. I have worked very hard to get to the point where I could buy a truck that I could be proud of and I take very good care of it. But I am afraid Im swabbing the deck on a sinking ship. Any and all info appreciated
  • Good evening cmanns,
    The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We can also get you more information on your corrosion warranty, if you like. Please email us the last 8 digits of your VIN at

    GM Customer Service
  • The GM warranty does not cover corrosion. They say that they do, but then they qualify it by saying they do not cover corrosion caused by the environment, which of course, is ALL corrosion.
  • Where did you buy the truck? How many miles? GM will likely tell you that they do not cover corrosion. That is their standard position, regardless of how old the vehicle is, how many miles, where it is operated, and how it is maintained.
  • craigmannscraigmanns Posts: 6
    edited August 2012
    The truck is an 08 GMC Sierra ext Cab. It has 39681 miles. I was it once a week including undercarriage. I live in Cape Coral Fl. It is SW Florida, but the saltwater is 10 miles away. I purchased from Roger Dean Chevrolet.
  • Email me with your phone number or email address and I will explain the GM warranty as they presented it in court and what your options are.
  • If you have one of the bad ones it's a losing battle. Don't listen to anyone telling you it's an area or salt on the road crap. I was speaking to someone recently about this issue and snapped a few pics of a NEW one on the sales floor that already has this starting and had less than 20 miles on it.. Not all of them have this problem so it must be a manufacturing issue.

    Good Luck and try to keep rust off.
  • Kendonhank....My email is

    I appreciate it.
  • Craig,
    Thank you for your response. Unfortunately there isn't much I can do. I have documented your concerns for you. I apologize for your frustrations.
    GM Customer Service

    -----Original Message-----

    Sent: 8/20/2012 05:35:10 PM
    To: ""
    Subject: RE: Good evening cmanns, The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We ca...

    I spoke to the Service Manager Gary Herrmann 2395743326. He said its normal surface rust and there isn't anything they can do. I've attached some photos. I have put 7000 miles on this vehicle in the last year that I have owned it.

    > Date: Mon, 20 Aug 2012 16:03:05 -0400
    > From:
    > Subject: RE: RE: Good evening cmanns, The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We ca...
    > To:
    > Craig,
    > Thank you for the update. Please let me know how things go at the dealer. I look forward to your update.
    > Christina
    > GM Customer Service
    > -----Original Message-----
    > From:
    > Sent: 8/20/2012 01:28:31 PM
    > To: ""
    > Subject: RE: Good evening cmanns, The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We can al...
    > Thanks Christina,
    > I will take the truck to Roger Dean Chevrolet. They are in Cape Coral, FL.
    > The truck is an 08 GMC Sierra ext Cab. It has 39681 miles.
    > VR,
    > CM
    > > Date: Sun, 19 Aug 2012 17:09:43 -0400
    > > From:
    > > Subject: RE: Good evening cmanns, The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We can al...
    > > To:
    > >
    > > Craig,
    > > Thank you for taking the time to email me with your concerns. How many miles do you have on your vehicle? Have you had your vehicle diagnosed at a GM dealer? If not, the first thing I will need you to do is take the vehicle to the dealer to have them diagnosis the concern. Please let me know when and where you plan to do that. Please include your complete contact information including mailing address. I look forward to your response.
    > > Christina
    > > GM Customer Service
    > >
    > >
    > >
    > > -----Original Message-----
    > >
    > > From:
    > > Sent: 8/17/2012 09:46:08 AM
    > > To:
    > > Subject: Good evening cmanns, The recommended underbody care is to (at least anually) rinse away any chemicals or road salts with plain water. We can also g...
    > >
    > >
    > > Im having corrosion issues with the underside of my truck. VIN 81229913
    > >
    > > Regards,
    > > Craig Manns
  • As many of you have found....GM is not going to stand behind their product. Ok who is the jack wagon that said maybe GM will help with the issue if you go about it professionally? Not happening. I'm posting pictures on Facebook and Floridasportsman and every social media site I can find.
  • Ken,
    Just wondering if you have sent that email? I am watching for it.
  • If the body is good then sell it fast before it's not worth anything or even driveable. Here's mine "> 4 yrs ago. Grinded it down and POR15'd the whole frame. Glad it's being sold. -33_882.jpg -50_818.jpg
  • Craig,

    Do not waste your time with Christina. She will simply input your complaint. She will not/cannot do anything for you because GM does not cover corrosion under their warranty, regardless of how severe it is, how old your vehicle is, where it is stored, how it is operated, or how it is maintained.
  • We also own a GMC Sierra. It is only used three months out of a year. It has very little mileage but the under carriage is nothing but rust. The brake line broke and other brake issues had to be address leaving us with a bill of almost forty three hundred dollars. My warranty just went out in March. If I would have known before there was a rust warranty on this vehicle I would have definitely put in a claim. I am very disappointe as this is our second Sierra. Our first wast totaled a few months after purchasing so we had little time to have issues with it.
  • If anyone has any positive results on getting this issue looked at by GMC I would like to have that person reply to my posting. Thanks
  • Patty my truck is in shop this very minute with a 4235.00 price tag. We had just taken my camper in for repair and was on our way home without the camper in tow when my brake line broke. I could have been hurt along with others in this situation. My brake light did not come on till I turned into a parking lot and the line broke. I am very disappointed reading these post and hope someone can get GMC to face up to this very serious situation.
  • GM does not have a rust warranty. They claim to cover the sheet metal, but then in the next breath they will tell you that they do not cover rust caused by the environment, which as you know, is all rust. The only way to force them to address this problem will be by complaining to the NHTSA, or a few high-profile accidents. They don't call them Government Motors for nothing.
  • I am so sorry to hear of your issues. I have been trying to find a way to get a class action lawsuit or a new recall investigation on this issue, but I feel as though I have not gotten any where. I have a blog I started last year hoping I could get the word out... it is ,,,, you will find a lot of useful information on it. From what I have found out the problem is a combination of poor metal used ( cheaper ) and poor design. The way the frame was designed water pools in the frame area. There was a recall investigation, but since the US government bailed out GM I doubt that will ever go anywhere.
    On that blog I posted a link to a gentleman who was very organized and was trying to get resolved with GM. He actually did get his repairs taken care of, not sure how, but I think it was like a part time job to do it.
    If anyone knows how to proceed with this, please please post on this site or my blog. We are not looking for a windfall, just a safe truck that does not disintegrate.
  • I made the mistake of trading in a perfectly good Dodge Ram for a 2010 GMC Sierra, have all kinds of issues, rust, paint chipping, bad springs, drivers seat bottom keeps coming apart, now my lights are flickering all of the time, have had a torque converter and a rear main seal replaced, 2 alternators, the battery, the exhaust manifolds look like something from the 70's that was sitting in a field, cannot clean the interior plastic,etc, etc. I took a survey, the customer service dep't is doing great but when asked, "Would you but another GM truck?' I definitley said NO!
  • My theory is that there is something in the design that is creating an electrolysis or electrical circuit (cathode/anode) effect and accelerating corrosion of all the undercarriage metals. Could be poor grounding, or perhaps substandard metals in the frame. It's not just the frames. Something is causing the corrosion to spread to other components throughout the undercarriage. I have seen this on many fairly new vehicles, including those that have been garaged.
  • gmcustsvcgmcustsvc Posts: 4,251
    Good morning casilla,

    We're sorry to hear that you are having so many troubles with your Sierra and are here to look into anything further if you like. Please contact us via email at (include your name, contact information, the last 8 digits of your VIN, and the name of your dealership with your inquiry).

    Sarah, GM Customer Service
  • I purchased this vehicle brand new. I use it very little 10000 miles since purchased. The entire undercarrage is rusted. The brake lines rusted through and my vehicle had to be towed. These trucks are not of the quality I thought it would be. Very disappointed that so many others are having the same problems and that GM is not addressing this. This is a total disappointment. Now my heat is not working not sure if I want to keep putting money into something that is rusting away rather quickly.
  • Phil,

    What year is your truck. Are you within the three year warranty. What did GM say? Where abouts are you located?
  • forresthforresth Posts: 29
    edited December 2012
    I had exactly the same issues on my 2004. You should also create a complaint on You can search my posts for more people experiencing the exact same rust issues. I have had all my rotors replaced 2 times and all the lines replaced. The truck has less than 20k miles on it. I also had to have the power steering cooler replaced. The fuel lines will be the next to go.
  • Located in NJ. The truck is out of warranty. I will not use a Chevy dealer for any repairs since the parts they are replacing are the same one that rusted out. No more Chevys after this one rusts away
  • My 99 silverado Z71 is rusted and frame is rusted out!
    I would love to see chevy do a recall.
  • 2doorpost2doorpost Posts: 74
    I traded in a 2008 Silverado with no frame rust issues for a 2011 GMC Sierra thats frame is peeling its coating like its shedding its skin.

    Couple that with parking it on my new driveway, and the result is rust streaking all along the drive.

    The truck only saw one mild winter, and was parked all winter long for this past one.

    Just plain junk, plain and simple.

    I've been buying GM trucks since 1976. This will be my last.
  • casillacasilla Posts: 20
    Yup! my bumpers are rusting now, the exhaust manifolds and door hinges as well, I do not think it will last the 3 years I have left to pay on it! I wish I would have kept my Ram! I screwed myself and GM gave me the reach around!
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