2007 C230 Sport shifting problem - Mercedes-Benz Forum
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#1 (permalink) Old 11-11-2011, 09:35 AM
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2007 C230 Sport shifting problem

Hi guys,

I recently purchased a 2007 C230 Sport sedan with 110k miles and have noticed a slight problem with the shifting pattern in the automatic transmission.

Here is the problem:

From stop, I've had no problem getting into 1st gear with a shift around 2500 RPM. In 2nd gear at around 2500 RPM the transmission quickly shifts so that the engine races a bit and the RPMs go from 2500 to 3200 RPM in the matter of a half a second. It almost sounds like the transmission quickly downshifts into 1st and then quickly shifts into 3rd. I've had no problems with hard shifting or grinding of gears. And the problem is more pronounced as you step on the accelerator aggressively.

I took my vehicle to the dealer and was able to replicate the problem with the technician. Since the vehicle had been serviced at this dealer, the service consultant told me that the transmission fluid and filter had been changed only 2,000 miles ago before being sent to auction. They told me that they could not find any error codes in the onboard computer and that there were no additional software updates. They finally recommended that I continue to drive the car as normal and the problem may or may not get worse.

Have any of you experienced a shifting problem like this? I believe that the problem is not with the transmission but rather with the onboard computer (transmission contrul unit - TCU). I spoke with MB Customer Service and they have not heard of a problem like this nor do they have any service bulletins regarding this issue.

Can anyone shed light on this situation? Is the problem simply a bad TCU or a programming issue or is it something more serious like a bad transmission?

Thanks!
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#2 (permalink) Old 11-11-2011, 02:12 PM
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i dont know if this ecu reset works on your car but

turn the key to position 2 in which all lights on the cluster light on

press the gas all the down until u push the button with your foot....hold the button down for 6 seconds

then your foot holding down the button turn the key to postion 1 where only the battery stuff is on

then drive your car hard a bit....if will cause the trans to hold the gear much long and feel like new
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#3 (permalink) Old 11-11-2011, 02:13 PM
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oh yea since ur over 100k i over flush your differantial fluid its very nasty over 100k miles
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#4 (permalink) Old 11-12-2011, 06:53 AM
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Thanks for the info! I will try to reset the ECU using the technique you've described.

I asked the dealer if the technician noted anything ususual about the transmission flush and fill on the service report and he said there was nothing noted. He did mention, however, that the technician added a special MB fluid in the transmission fluid to aid in smoother shifting. I don't know what that is but it sounds like the previous owner complained of a similar problem.
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#5 (permalink) Old 11-18-2011, 01:34 PM
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After some more thought, I believe my tranmission is slipping at the top end of 2nd gear - from 2500 RPM to 3000 RPM. But how does this happen???

Did the previous owner in some way abuse the transmission by running it too hard or is it a manufacturer's defect? Can someone school me?
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#6 (permalink) Old 11-18-2011, 05:01 PM
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did they "flush" the system ?

or drop the pan and drain the fluid out?

i heard on here flushing the system might cause problems
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#7 (permalink) Old 11-18-2011, 06:22 PM
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Originally Posted by sammy567 View Post
did they "flush" the system ?

or drop the pan and drain the fluid out?

i heard on here flushing the system might cause problems
Yes, the 722.9 (7Gtronic) transmission should have a simple drain, filer replacement and refill, which will only change about 1/3 of the total fluid capacity. This is prescribed at 39K miles. MBZ will deny any warranty claims if the transmission fails and this service was not performed this exact way.

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#8 (permalink) Old 11-19-2011, 07:11 AM
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I'm not sure if they did a complete flush or simply a drain, filter & fill.

The service advisor did say that they added a special MB fluid which helps the transmission perform better. I guess the prior owner complained that the transmission was slipping a bit?
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#9 (permalink) Old 11-19-2011, 08:35 AM
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If the service was performed by an authorized dealer, then I would not worry about that being the issue as they would have used approved fluids and procedures. You could just have a minor problem that's going to manifest itself with this slippage feeling, or it could be something major. I'd pull codes on the transmission to see if anything is going on there. If not, then keep driving it until the symptoms change. The 7Gtronic has some peculiar properties that have caused a lot of customer complaints, but in the end, 99.9% are just normal operation.

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#10 (permalink) Old 09-07-2012, 07:02 AM
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Here's the latest. I got fed up with the poor shifting and RPM acceleration between 3rd and 4th gear so I took it back to the MB dealer for another evaluation.

This time they found the problem! They hooked up the transmission hydraulics to a monitor and found that the hydraulic pump assembly was going bad. The service guy recommended that while they are repairing the pump assembly that they might as well put in a rebuilt transmission for $500 more.

The service guy told me that MB model years 2003-2006 had the 722.6 transmission package which called for transmission oil change at 100,000 miles. My model (beginning in model year 2007) has a different transmission package (722.9) which calls for a transmission oil change every 40,000 miles. Guess what? The first transmission service on MY vehicle was done by the original owner at 100,000 miles. It should be no surprise that the transmission is now fried! And since I bought the car from a wholesaler, I am left holding a $4200 loss for a new transmission and pump assembly!

Maybe it's time to get out of this car all together? I can't sell my car in all honesty with this problem. I'm working with the dealer for them to buy my car, fix the transmission at their cost and sell it to someone else for a profit. That means that I will be taking it up the <you know what>!

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