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722.6 transmission, fault code P0700

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Former Member
Sokoloff's picture
Ocean Isle Beach, NC
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Joined: March 29th, 1995

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2553

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2003 SLK320
1983 240D

Having intermittant transmission shifting problems. Threw a P0700 Transmission Control System code twice in the past month. Did a search and never found any references to that code. Anyone ever had it? Ideas for the fix?

Thanks.

Len
'99 E300TD 82,000 miles

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

Anonymous
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Anonymous's picture
codes

Hi The code that you got was from the ECM and it means look into the Trans control module for another code which will tell you the problem.joeym

Former Member
Sokoloff's picture
Ocean Isle Beach, NC
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Joined: March 29th, 1995

Posts:
2553

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2003 SLK320
1983 240D

Thanks Joey. Does that mean a trip to the dealer to read the 38 pin connector in the fuse box? How specific does the control module code get, i.e. enough that it will identify the part that is the problem and one that I can maybe replace? Are there things such as software upgrades or service campaigns for this transmission that might be needed?

Is it possible that an incorrect fluid level could trigger the code?

Len

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

Anonymous
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Anonymous's picture
trans

Hi The codes in the trans module will set you on the path yet something like a leaking plug connector on the trans can pop up all kinds of codes,yet the components are not bad.I would have someone scan it with a good reader,clear them and then freeze frame to see whats going on.like I said check the front right side of the trans for a leaking eletrical plug very common and may place the trans in a limp mode.joeym

Former Member
Sokoloff's picture
Ocean Isle Beach, NC
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Joined: March 29th, 1995

Posts:
2553

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2003 SLK320
1983 240D

Thanks again Joey. Several weeks ago I opened up that electrical connector to make sure it was dry inside. I had replaced it about a year ago because it was leaking. I have a new one on hand, but didn't use it because the one there was dry.

When I replaced that connector, I wasn't expecting ATF to drain out. I replaced the fluid that drained out, but I only estimated how much I needed. Didn't have the foresight to measure what came out and don't have the dipstick yet. Could an incorrect fluid level trigger the problem and code?

Len

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

Anonymous
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Anonymous's picture
trans

Hi It could be many things( fluid level,conductor plate,module ect0 you need to have the codes read and cleared and if he has a good enough scanner check and reset if needed the adaptations,if you were close by I would be happy to help,or if you find someone near by have him call me.joeym PS when you lose fluid from thr connector its no more then half a quart

Former Member
Sokoloff's picture
Ocean Isle Beach, NC
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Joined: March 29th, 1995

Posts:
2553

Vehicles
2003 SLK320
1983 240D

A half a quart is what I guessed and that's about what I added. I'll be at a dealer this Saturday. Maybe I can get them to do a quick read for me.

I'll let you know. Appreciate the help.

Len

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

Anonymous
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trans codes

Hi Len I would watch out for the quick read or test.it will most likley cost you more money.The other thing is to have them check the shifter module while they are testing the system.joeym

Former Member
Sokoloff's picture
Ocean Isle Beach, NC
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Joined: March 29th, 1995

Posts:
2553

Vehicles
2003 SLK320
1983 240D

Finally bought the tool to check the fluid level and have some questions. What is the proper procedure for checking the level? I checked it after a long road trip with the engine running after I ran the shifter through all the gears and checked it while in Park. Didn't even register on the dip stick. Maybe low fluid was causing my problems. Added about three quarters of a liter and it is now between the cold and hot marks. It was a little tough to get an accurate reading because the fluid was still running down the dip stick tube. Haven't really run the car enough since to get it up to temp, so I haven't verified the level. When checking it warm or cold, should the engine be running and the transmission in Park? That's how they were supposed to be checked in the old days as I recall.

Thanks.

Len
'99 E300TD 88,000 miles

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

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Low mark is the shop temp (59F) and the upper mark is the "Wow, is that hot" :eek: mark. Shop temp mark is used when a repair/service has been done on the 722.6 trans and you need to fill to the proper level.

Former Member
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Ocean Isle Beach, NC
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Joined: March 29th, 1995

Posts:
2553

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2003 SLK320
1983 240D

Dick - I thought that I read somewhere that a TSB said to ignore the shop temperature level and always check it and fill it to the hot level.

Still, how about the proper procedure for checking it - car running and in park after running it through all the gears?

Len

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Len

'59 220S cabriolet

'83 240D 348,500 miles original owner

'99 E300D 170,000 miles

'03 SLK320 27,500 miles

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Haven't found that TSB. But I'm going to look! Problem is the hot line level is only acheived after a long hard run. The ATF has to be too hot to touch, and that's in the hand of the beholder, hence use of the shop temp line.

Yes, level is checked with engine running, in park and at an idle. For best results, let it idle about 5 min after you fill it up or you'll be wiping the tool off forever.

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Babylon, NY
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1996 S420 LWB
1995 S350

When I bought my dipstick tool I asked the same question about the markings. One of the Dealers Techs was at the counter and he said that the car should be driven for at least 45 minutes before the final topping off of the transmission.

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