'99 E320 - Need help with transmission problem and preventative maintenance - Mercedes-Benz Forum
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post #1 of 47 (permalink) Old 04-01-2019, 12:47 AM Thread Starter
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'99 E320 - Need help with transmission problem and preventative maintenance

Okay, so there was an issue with my E320 this weekend. My little brother has been using lately and he told me that the car had stopped accelerating while on the freeway. He had to pull over and make a complete stop in order to get the car working properly again.

He wasn't sure at what speed, but at some point he felt a jolt and the car began to slow down, though the engine kept running with the RPM at redline.

I hooked up my cheap OBD2 scanner and it gave me trouble "P0700 Transmission control system -malfunction"

I'm not sure where to begin and need help from you guys, and this also leads me to my second question about preventative maintenance.

I have a '99 E320 with 137K miles and '97 E420 with 106K miles. Didn't have either for too long and I don't have any service records.

It's mostly been me doing short term and easy maintenance like oil, filter, coolant, brakes, etc., and fixing whatever my OBD2 scanner detected, but these cars are old and high mileage, and I don't want anyone getting stranded. We often drive through the mountains and desert where there's no cellphone signal, so it's very concerning...

Do you guys know of a resource, like service intervals, or adjustments to them now that these cars are old, and parts that at known to fail and should be replaced after certain miles/age?

Like the transmission fluid in this case I don't know if it's ever been replaced, it could be the cause of this issue and trouble code P0700...

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post #2 of 47 (permalink) Old 04-01-2019, 01:06 AM
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Check the stickies for Transmission 722.6 .
They should have fluid ,filter,gasket and connector bushing replaced.
You could try that but you might need a new conductor plate as well.
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post #3 of 47 (permalink) Old 04-01-2019, 01:09 AM Thread Starter
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Check the stickies for Transmission 722.6 .
They should have fluid ,filter,gasket and connector bushing replaced.
You could try that but you might need a new conductor plate as well.
Yeah, I'll read through those in the morning, I'm also currently reading what @Pin2 is going through right now in his recent post I just discovered.

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post #4 of 47 (permalink) Old 04-01-2019, 01:21 AM
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Yeah , unfortunate for him , very unusual ,,
Note that 7mm bolt unscrews but does not actually come out ,it is captive.
The o rings in the bushing often leak ,causing fluid to migrate to the TCU ,causing malfunctions.
If your cars have never had trans ,service they will definitely need it.
Partial fluid change should be done every 40,000 miles ideally.
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post #5 of 47 (permalink) Old 04-01-2019, 01:54 AM Thread Starter
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Yeah , unfortunate for him , very unusual ,,
Note that 7mm bolt unscrews but does not actually come out ,it is captive.
The o rings in the bushing often leak ,causing fluid to migrate to the TCU ,causing malfunctions.
If your cars have never had trans ,service they will definitely need it.
Partial fluid change should be done every 40,000 miles ideally.
I searched a few of the terms at the FCP Euro parts shop and this "service kit" showed up.

https://www.fcpeuro.com/products/cop...on-service-kit

I'm still researching the problem and possible procedures to fix it, but I hope it's as "easy" as buying one of these kits and a jug of Pentosin automatic transmission fluid... lol
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post #6 of 47 (permalink) Old 04-01-2019, 03:38 AM
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You will also need the transmission dipstick to properly calibrate the fluid.
Also read up on a spring replacement in the valve body. It can break and cause shift problems. Easy fix. I think it pertains to the 99 though later versions had a beefier spring.
Suggested reading of @MAVA posts as he has plenty of experience with these transmissions.


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post #7 of 47 (permalink) Old 04-01-2019, 04:31 AM
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Check the ATF quality (color, smell) and level first.
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post #8 of 47 (permalink) Old 04-01-2019, 04:53 AM
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You really should use fluid which meets MB spec 236.14..
Genuine MB or Shell ATF134 for example.
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post #9 of 47 (permalink) Old 04-01-2019, 12:26 PM Thread Starter
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You will also need the transmission dipstick to properly calibrate the fluid.
Also read up on a spring replacement in the valve body. It can break and cause shift problems. Easy fix. I think it pertains to the 99 though later versions had a beefier spring.
Suggested reading of @MAVA posts as he has plenty of experience with these transmissions.


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I get sent to the conductor plate whenever I type "valve body spring"...

https://www.fcpeuro.com/products/mer...e-1402700861oe

Is it part of the conductor plate assembly?

I did get a result to an actual spring on eBay though...

https://www.ebay.com/itm/68942-01-72...frcectupt=true
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Check the ATF quality (color, smell) and level first.
Man, now I have to wait for a dipstick to arrive because of this "sealed for life" nonsense Mercedes-Benz came up with... I'll come back with pictures whenever it arrives...
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Originally Posted by Benzyle View Post
You really should use fluid which meets MB spec 236.14..
Genuine MB or Shell ATF134 for example.
Oh yeah, I definitely will. I don't skimp on gas or any of the cars fluids lol

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post #10 of 47 (permalink) Old 04-01-2019, 02:17 PM
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Sounds bad.

One can't know for certain unless you have a professional take a peek at it, but there is a bearing that is a very common point of failure for the 722.6 - it is the K2 bearing, from what I recall.

Mine exploded at about 170k.

I got a fresh rebuilt one, with the revised bearing (newer style trans that they put in the 00-02 cars with revised parts) and I got it from Sun Valley Transmission out of California. Excellent service and those guys know exactly what they're doing.

If you end up having to do a total replacement, I would suggest them as your best option.

There is no point in replacing it with another used trans from another 99 model, the same thing will happen to it.

Sun Valley suggests changing the fluid on them every 24k miles.

Also, conductor plates, as mentioned, can fail, which is due to bad fluid and not being able to properly cool the electronics. You avoid this problem (at least try to avoid it, anyway) with regular fluid changes.

Matt

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