722.9 7-speed transmission problem. - Page 8 - Mercedes-Benz Forum

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post #71 of 87 (permalink) Old 09-01-2010, 07:01 PM
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Quote:
Originally Posted by zhuorongdeng View Post
I have a 2006 C230 Sport with 60,000 miles. The car has a 722.9 7-speed transmission.

At 39,000 miles, according to the user manual, I ask a dealer to flush the transmission for me. About one month after the flush, some transmission problem started to show up.
Strange coincidence.....

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Originally Posted by mrluigi View Post
strangest thing is that the problem occurred 5-6k miles when I change the ATF - strange coincedence..........
I have 722.9 seven-speed transmission in my car and my car also start having slipping transmission problem 4k miles after the 39,000 miles transmission flush service. Coincidence you think?

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post #72 of 87 (permalink) Old 09-15-2010, 04:12 PM
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Originally Posted by Raindrop View Post
Strange coincidence.....



I have 722.9 seven-speed transmission in my car and my car also start having slipping transmission problem 4k miles after the 39,000 miles transmission flush service. Coincidence you think?

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722.9 transmission is POS in my opinion. Maintenance is more expensive and when a problem occurred, you need to shell out a lot of money to get the entire valve body unlike 722.6 transmission where you can get just a piece of the part from the valve body if one of the sensor failed.

I ended up bringing my car to dealer and spend close to $2K to get my valve body replaced. All good now though.
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post #73 of 87 (permalink) Old 09-17-2010, 04:24 AM
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the trans control unit on the 722.9 trans is now available seperately. this started about 2-3 months ago. it is a pain in the ass though. if the car has speed sensors faults then the control unit can be replaced at a cost of $500 for the unit. now if the info from the old unit can be downloaded into the das it can be replaced, if it cant the entire valve body is needed. if there are codes for shift solenoids then the entire valve body is needed.
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post #74 of 87 (permalink) Old 09-17-2010, 07:34 AM
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Originally Posted by zhuorongdeng View Post
Some updates.

Visitted the dealer yesterday. First, The technician confirmed that the 2nd symptom, the clunk when the gear engages, is also caused by the the fact that the transmission is in limp home mode at the moment, and it is directly engaged at 3rd gear. He said that it seems to be a heat related problem based on the fact that it happened after stopping the engine for a while and at local drive . It can be caused by any thing from low fluid level (they checked it before and it is not the case), a clog filter (they did not change it when the ATF was flushed at 39000 mile), etc. The problem can be more severe according to the code of P7017, that inicates the whole valve body needs a replacement. Replacing a valve body is a $2200 job!

I may ask them to change the filter and re-flush the transmission first, which is at around $550.
I would first check the high pressure solenoids that sit on the valve body.
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post #75 of 87 (permalink) Old 09-18-2010, 04:12 AM
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there is no point in checking the shift solenoids, you cant replace them seperately, re part of the valve body. either you replace the control unit when you have speed sensor codes or you replace the whole valve body when you have shift solenoid codes or the trans shifts erratic.
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post #76 of 87 (permalink) Old 09-18-2010, 11:45 AM
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Originally Posted by Streetglower View Post
the trans control unit on the 722.9 trans is now available seperately. this started about 2-3 months ago. it is a pain in the ass though. if the car has speed sensors faults then the control unit can be replaced at a cost of $500 for the unit. now if the info from the old unit can be downloaded into the das it can be replaced, if it cant the entire valve body is needed. if there are codes for shift solenoids then the entire valve body is needed.
I only replaced mine about a month ago, wondering why the dealer told me to replace the entire valve body? The error code is for the turbine speed sensor.
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post #77 of 87 (permalink) Old 09-19-2010, 08:13 AM
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Originally Posted by violato View Post
I only replaced mine about a month ago, wondering why the dealer told me to replace the entire valve body? The error code is for the turbine speed sensor.
alot of times its better that they recommend the entire valve body instead of just the control unit. reason being its to avoid any future issues. lets just say they replace just the control unit and a few months later your trans is shifting like shit. or you have codes for a bad shift solenoid. now you need a valve body. how would you feel that you just paid $1500 for a trans repair and now you need another $2000 repair. now if you bought the valve body to begin with and an issue arrives months later its now a parts warranty matter. there are certain parts on the vehicle that its better to replace the entire unit then to repair it. even if the repair will fix your current issue. when its warranty we are only allowed to fix what is bad. right now if we have a code for a speed sensor we can only replace the control unit. if we do the valve body it gets sent back to the dealer and the dealer is debited the warranty claim.
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post #78 of 87 (permalink) Old 09-19-2010, 08:32 AM
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Originally Posted by Streetglower View Post
alot of times its better that they recommend the entire valve body instead of just the control unit. reason being its to avoid any future issues. lets just say they replace just the control unit and a few months later your trans is shifting like shit. or you have codes for a bad shift solenoid. now you need a valve body. how would you feel that you just paid $1500 for a trans repair and now you need another $2000 repair. now if you bought the valve body to begin with and an issue arrives months later its now a parts warranty matter. there are certain parts on the vehicle that its better to replace the entire unit then to repair it. even if the repair will fix your current issue. when its warranty we are only allowed to fix what is bad. right now if we have a code for a speed sensor we can only replace the control unit. if we do the valve body it gets sent back to the dealer and the dealer is debited the warranty claim.
+1 on this and it makes perfect sense.

ERIC.

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post #79 of 87 (permalink) Old 10-21-2010, 06:00 AM
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Dear all

After six months of denial from MB about every failure from internal speed sensors to wheel speed sensors etc. and the possibly lethal effect they can have we have finaly nailed active faults in virtually every safety related hardware in our S350.

We served MB with legal notices for appalling failures in the transmissions and ESP hardware of our CLS350(july07) and our S350(july06) when they claimed that we could not “demonstrate” the faults for their engineer.

Fortunately Mercs being Mercs it was not long before we were able to diagnose the whole extensive failure.

Shockingly like the transmission sensors that have been failing for years the ESP sensors and wheel speed sensors also carry defects and this is well known to our friends at MB. Only problem is that they have circulated this information to their dealers on the sly and they are carrying out replacements without any acceptance of blame. Our cars were reported with these multiple faults at 2.5 and 3.5 years of age but customers are facing these problems on brand new cars and each case as we have painfully found out is different and needs different approaches.

Videos are uploaded to
YouTube - MercsgoneBerserks's Channel
and we would appreciate any feedback and stories of similar failures. As you will see in the videos the wheels merrily show ridiculous data which is then allowed to flow through the system wrecking havoc on the ESP and transmission. It took us ages to catch the faults live while connected to the scanner. We would advise all Merc owners to unconditionally demand a recall of all critical sensors and the installation of safety barriers to prevent these failed data signals from interfearing with the motion of the vehicle and its braking and ESP functions. At present all Mercs are potential coffins on wheels.

Last edited by LoonyS350; 10-24-2010 at 11:25 PM.
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post #80 of 87 (permalink) Old 10-21-2010, 06:50 PM
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Originally Posted by LoonyS350 View Post
Dear all

After six months of denial from MB about every failure from internal speed sensors to wheel speed sensors etc. and the possibly lethal effect they can have we have finaly nailed active faults in virtually every safety related hardware in our S350.

We served MB with legal notices for appalling failures in the transmissions and ESP hardware of our CLS350(july07) and our S350(july06) when they claimed that we could not “demonstrate” the faults for their engineer.

Fortunately Mercs being Mercs it was not long before we were able to diagnose the whole extensive failure.

Shockingly like the transmission sensors that have been failing for years the ESP sensors and wheel speed sensors also carry defects and this is well known to our friends at MB. Only problem is that they have circulated this information to their dealers on the sly and they are carrying out replacements without any acceptance of blame. Our cars were reported with these multiple faults at 2.5 and 3.5 years of age but customers are facing these problems on brand new cars and each case as we have painfully found out is different and needs different approaches.

Videos are uploaded to "http://www.youtube.com/user/MercsgoneBerserks?feature=mhum#p/u/0/6W0ynEahH_A" and we would appreciate any feedback and stories of similar failures. As you will see in the videos the wheels merrily show ridiculous data which is then allowed to flow through the system wrecking havoc on the ESP and transmission. It took us ages to catch the faults live while connected to the scanner. We would advise all Merc owners to unconditionally demand a recall of all critical sensors and the installation of safety barriers to prevent these failed data signals from interfearing with the motion of the vehicle and its braking and ESP functions. At present all Mercs are potential coffins on wheels.
personally i think you are just whining and crying because you dont want to pay for the repairs. i think thats all it ever amounts too when people sue MB. i can understand a crash caused by a bad component, but not because "its a common problem" and "everyone has had the issue". i wouldnt say MB is a coffin on wheels, i drive a 2009 ML350 and love the car. it rides 10x better then my honda did, and is more stylish. yea i too have the occasional jerky trans and what not but thats not gonna stop me from driving it.
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