7 Speed automatic problems ** safety ** - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 02-16-2012, 10:48 PM Thread Starter
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7 Speed automatic problems ** safety **

Hello all, this issue has serious safety concerns and is something that needs immediate attention and action taken. Please read on.

I have a 2007 GL 450 that has begun the notorious 7 speed (722.9 NAG2 (7G-Tronic) Transmission) etc. electronics failure. It will get stuck in a random forward gear with no apparent driver/user solution but to power cycle the vehicle. (Shut it down, and restart.) If you shift to neutral, it will stay there and not engage any other gear (forward or reverse) until you shutdown and restart. This almost sounds like a bad personal computer operating system. Imagine being in the middle of a normally safe three-point-turn to find the vehicle won’t move unless you shut it off and restart! It happened to me today.

This is a load of nonsense – this problem is not due to abuse, misuse, neglect, or even reasonable wear and tear. I have found others that have been told “the valve body is warped”, etc – so it follows restarting the car un-warped it? Do these people (the dealers) really know how to service these vehicles? This is clearly an electronics failure.

This is an absolute design/manufacturing flaw of the "conductor plate and valve body assembly", and my research carries that the Benz 7 speed transmission is notorious across many models and platforms, and there are many TSB’s on it; recently (Date: April 8, 2011 Order No.: S-B-27.00/120 Group: 27 SUBJECT: All Models Equipped with 722.9 NAG2 (7G-Tronic) Transmission) and it is a well documented problem internally within MBUSA.

Beyond warranty? Not a CPO vehicle? Okay - but - ….

Try this - If my wife (or yours) gets off the freeway, comes to a stop, and then attempts to proceed normally with the vehicle now stuck in 5th (or whatever it chooses) gear, - there is a reasonable user presumption that the car would accelerate normally and be able to safely join traffic....instead it crawls forward at a few miles an hour into potential harms way with no way to accelerate the vehicle normally, thereby leaving the driver and our children in danger. I speak from personal experience.

This is not just a defect, it is a safety issue, and MBUSA needs their feet held to the fire on this one.

It is unreasonable for any manufacturer to tout "The best or nothing" and "Engineered like no other car in the world" and then expect the consumer to pay $2000+ to fix a known electronics design/manufacture flaw. There are even rumblings that VDO (speed sensor/electronics manufacturer) and MB are at odds over who is actually to blame, so clearly they both see costs are going to mount when the inevitable recall occurs. I plan to notify the NHTSA among others if I don't get some favorable answers immediately.

To make it worse, Part # 220 270 27 06 88 is what I am told I need, costing $838.00. (wow!) If I wanted to buy this part outright and have my indy shop or myself install it, I STILL have to go to the dealer for "programming" that I nor most indy shops can carry out.
So regardless of who is at fault, you are railroaded into going to the dealer, dealing with their dismissive “here’s the bill” attitude and paying their inflated rates regardless. You as a consumer are left with no other recourse. I wonder if there is a legal challenge with that in and of itself. To the OP, it sounds like they even robbed you on the part alone.

In summary, they build a defective transmission that will certainly leave you in harm’s way, and then they (MBUSA) say “too bad, pay US to fix it or you have no other option.” I question not only the ethics but legality of this position MBUSA has taken.

I am collecting names, vehicle types, and e mail addresses for any that are interested in signing on to force MBUSA into a recall based on safety (or lack thereof) alone.

I do not seek anything more than an email address, name, and year/make/model affected. Your information will not be used for any other purpose but adding strength to my argument with MBUSA. Feel free to PM me, or email aplguys@aol.com.

Understand absolutely clearly that I am not attempting to defame, discredit, or slander MBUSA in any fashion, but I will not have safety compromised in a premium vehicle and then be billed for it, nor will I be lead to believe it’s “normal wear and tear, abuse, misuse, or neglect”. This is a flaw that compromises safety, period.

I bought my GL450 because I love my Mercedes Benz E55 AMG so much. I bought another Benz because of the quality previously displayed and that one would reasonably expect. Maybe I should have kept my Dodge Durango Limited. What’s right is right.

If we stick together, maybe good will prevail. There is strength in numbers.

I want to hear from all of you affected!
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post #2 of 11 (permalink) Old 02-16-2012, 11:08 PM
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I am not in the mood to study your long rant, but my understanding is that you want to sue MBUSA before finding what is the problem with your car?
First thing is first.
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post #3 of 11 (permalink) Old 02-16-2012, 11:36 PM
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Quote:
Originally Posted by Chris Buffalo View Post
This is not just a defect, it is a safety issue, and MBUSA needs their feet held to the fire on this one.
Wouldn't MBUSA have to pay you for filling the tank too? I think it would be a safety issue if you run out of gas just when you need to accelerate to join the highway traffic.
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post #4 of 11 (permalink) Old 02-17-2012, 09:23 AM
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>>2007 GL 450
Now is 2012.
How many miles on the vehicle? What's MB recommended interval for transmission service?
I'd make sure the recommended trans service(s) has(have) been done by authorized mechanic(s) before I proceed to make a case against MB.
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post #5 of 11 (permalink) Old 02-17-2012, 12:10 PM
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The MB transmission service interval for the electronic transmissions is about 40K miles.
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post #6 of 11 (permalink) Old 02-17-2012, 12:31 PM Thread Starter
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@ Kajtek - why would you bother posting anything at all, if you weren't even going to read? If you aren't interested then say nothing and move on.

This is a common problem, and a safety issue. I am trying to raise awareness is all, not stir up a bunch of ignorant negativity.

722.9 (7-speed) transmission corrosion issue - MBWorld.org Forums
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post #7 of 11 (permalink) Old 02-17-2012, 12:34 PM Thread Starter
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post #8 of 11 (permalink) Old 02-17-2012, 02:09 PM
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Originally Posted by Chris Buffalo View Post
@ Kajtek - why would you bother posting anything at all, if you weren't even going to read? If you aren't interested then say nothing and move on.

This is a common problem, and a safety issue. I am trying to raise awareness is all, not stir up a bunch of ignorant negativity.

722.9 (7-speed) transmission corrosion issue - MBWorld.org Forums
This is technical section to discuss technical problems. You don't report any problem with your car.
You are starting agenda to have MBUSA pay for maintenance on your 5-6 years old vehicle. Sorry, but the 3 years warranty deadline is set for a reason and even MB does lot of good will repairs, they are not charity.
We do have OT section for political agendas you know?
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post #9 of 11 (permalink) Old 02-21-2012, 09:37 PM Thread Starter
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OOkayy....for those that didn't read:

1) This IS a technical issue.

2) This is NOT a maintenance issue, it is a safety concern due to an apparent defect in design and manufacture.

3) There is no political agenda here

4) Running out of gas would be operator error and/or negligence. Designing a transmission that does not leave a motorist in harms way is not up to the operator. There is a reasonable presumption the vehicle would not have erratic transmission control electronics that will leave the motorist in danger.

Whew.
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post #10 of 11 (permalink) Old 02-22-2012, 07:36 AM
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Here's my opinion Chris, your original post send mixed signals which are even more mixed when you read your latest. The first post is filled with language which seems to be emotional and confrontational, yet you say in the same post that you are not attempting to defame, discredit, or slander MBUSA in any fashion. You may not have intended to send mix messages, but there it is.

Best of luck with your efforts.
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