'97 E320 in Limp Mode with P0700 - Mercedes-Benz Forum
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post #1 of 67 (permalink) Old 03-15-2019, 11:25 AM Thread Starter
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Arrow '97 E320 in Limp Mode with P0700

Hey All,

Wife was heading to work the other day and got stuck on the road car won't move, idles fine, gears box shift got P0700 code had it towed to home and now sitting on the driveway.

My plan of action once the weather starts getting warmer.

1st. Try the quick solution replace the Transmission Adapter Plug (since I have a spare one from the first time this happened back in 2013.)
2nd. Drop the pan and replace the conductor plate since this was the issue that happened in 2013.

I think this is a straight forward solution my only questions are:

1. How do I get new transmission fluid back into the case after I put the pan back on?
2. Anyone came up with an alternative to the Transmission Dip Stick, I found one for $30.00 on Amazon, rather not buy this since don't see too much future usage.
3. Should I do the transmission mount while I am down there? Car is 1997 with 116K.
4. Any suggestion on where to get the conductor plate from?

Thanks Pin2

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post #2 of 67 (permalink) Old 03-15-2019, 11:51 AM
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The P0700 code is generic and the cause can be one or more of many things. If you have an access to a scanner that can read the codes from the TCM to identify what the 3 digit code or codes are that somewhat help you pin-point the root cause.

Is the car in electrical limp mode (meaning the car starts and goes forward and backward but at a set gear (usually second) ?

Or is the car in mechanical limp mode (the car starts and goes for a while then gets stuck to a gear (or transmission starts slipping) till you stop and restart the car ?

Or the car does not move at all with gear shifted to D or R?

You can do all those things you listed but this will not guarantee that it will fix your problem.
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post #3 of 67 (permalink) Old 03-15-2019, 12:12 PM
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Hi Pin2, we offer O.E.M. Conductor Plate (above valve body) 1402700861 for the 722.6xx transmission:
https://www.autohausaz.com/pn/1402700861

We'll post a special discount for Benzworld forum members in our Vendor section next week, stay tuned!

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post #4 of 67 (permalink) Old 03-15-2019, 03:23 PM Thread Starter
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Thanks Mr. Boca.

At at first the car moved after sitting for 2 days when I put it in D and R. Than when I tried again it does nothing in either D or R looks like the transmission is not engageing. Based on your feedback looks like Mechanical Limp Mode.

Here is a link to a video I took.

https://app.box.com/s/b1ivmetrbj8v0deac1k3o7gszqtbpzso

Thanks.




Quote:
Originally Posted by mrboca View Post
The P0700 code is generic and the cause can be one or more of many things. If you have an access to a scanner that can read the codes from the TCM to identify what the 3 digit code or codes are that somewhat help you pin-point the root cause.

Is the car in electrical limp mode (meaning the car starts and goes forward and backward but at a set gear (usually second) ?

Or is the car in mechanical limp mode (the car starts and goes for a while then gets stuck to a gear (or transmission starts slipping) till you stop and restart the car ?

Or the car does not move at all with gear shifted to D or R?

You can do all those things you listed but this will not guarantee that it will fix your problem.
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post #5 of 67 (permalink) Old 03-15-2019, 06:27 PM
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Can't access the video. Can you upload it to youtube ?

From what you are describing, it seems to be an issue with the rpm sensors on the conductor plate. This could be a conductor plate issue, or the trans connector adapter / TCM contamination issue. Again detailed codes from the TCM will help more.

You can replace the adapter and check the TCM out for contamination. If you are lucky, you will not have to reset the TCM which would require special diagnostic scanner that can read and reset TCM codes.
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post #6 of 67 (permalink) Old 03-15-2019, 07:23 PM
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No, mechanical limp mode = 2nd gear all the time. Every time you shift to R or D, it should feel like a very harsh clunk. That's mechanical limp mode. You can still move the car, even if the TCM is unplugged or pilot bushing out.

No moving while in R or D....that's different.
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post #7 of 67 (permalink) Old 03-15-2019, 07:27 PM Thread Starter
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Thanks here is the youtube link.

I checked the TCM module it didn't have any ATF contamination. I will check the trans adapter connector tomorrow.😊

Where can I get the code reader that you are referring to for TCM code?

Pin2


Quote:
Originally Posted by mrboca View Post
Can't access the video. Can you upload it to youtube ?

From what you are describing, it seems to be an issue with the rpm sensors on the conductor plate. This could be a conductor plate issue, or the trans connector adapter / TCM contamination issue. Again detailed codes from the TCM will help more.

You can replace the adapter and check the TCM out for contamination. If you are lucky, you will not have to reset the TCM which would require special diagnostic scanner that can read and reset TCM codes.

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post #8 of 67 (permalink) Old 03-15-2019, 08:32 PM
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Have a look at the link below for P0700. You will see multiple appearances with different symptoms. Have a look at the code 015 / 111 / P0700 which seems to describe your symptoms provided that this is the only fault present.

"Transmission does not transmit engine power." Is that what you are experiencing ?

STAR TekInfo

As you can see there are host of other reasons for P0700 combined with other codes. The scanner you need can read the 3 digit TCM codes like 015 / 111 from the TCM, and can also reset them which you may have to do.


Diagnostic equipment like Snap On, Autel, MB DAS, Delphi, CarSoft etc. can access the TCM using their specific 38-pin diagnostic adapters. These are not cheap and takes time to learn for some of them. Easiest way is to find someone who has them, or have the car scanned at a repair shop that has the right equipment (at a price of course).
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post #9 of 67 (permalink) Old 03-15-2019, 09:24 PM
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Well, damn. Today I learn a few things.

Quote:
Harness is damaged from ETC control module to each RPM sensor.
RPM sensors are faulty.
Hmmm, that does sound like the speed sensor on the conductor plate....that's much more common than a damaged ETC harness....unless OP has a mouse/rat/squirrel infestation.

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--2011 Suzuki DL650 58k
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post #10 of 67 (permalink) Old 03-16-2019, 12:27 AM
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Definitely sounds like a conductor plate issue, specifically y3/6n3. This seems to be, along with the starter lockout contact; the 2 things that cause failure on the conductor plate.

A scan is your first move though. You will be glad.


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