Hey guys. I've been having problems with my transmission 722.9 PLUS (7-speed automatic), rough gear shifts (upwards only) and randomly (you can drive well for an entire week and then...) you hear a loud bang (transmission disengages) and the PRND symbols disappear from the Instrument Cluster leaving you in LIMP mode.
There is no "Check Engine" light even though there are error codes (I'll show you guys in a bit) and if you turn off the ignition, remove the key and wait 10 seconds the PRND symbols will appear again and the car will work as normal for a few more minutes. Due to this being random, it's likely an electrical issue.

When I started having this problem out of the sudden I decided to go do a transmission oil change - It went well - Followed WIS procedure - Car started drove as normal and then randomly... Same problem.
• Transmission: 722.966 (PLUS)
• Transmission Oil Type: Blue (9L)
• Certification: MB 236.15
• Kit: Meyle 0141371107

I've checked the wiring going from the TCM module (Which is a VGS3, I can communicate with it without any problems using Xentry) and all seems good and secure, cleaned them a bit and covered a few exposed wires... Issue still happening.

All the error codes from Xentry (After clearing them and letting the issue happen again randomly):
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• Module: N3/9 - Motor electronics 'CDID3' for combustion engine 'OM651' (CDI)
• Fault(s): U010187 Communication with control unit "Transmission" has a malfunction. The message is missing.
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• Module: N62 - Parking system (PTS)
• Fault(s): C44700 Implausible data were received from the central gateway. / C10100 Communication with control unit "Transmission" has a malfunction
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• Module: N30/4 - Electronic stability program (ESP®)
• Fault(s): C257200 No CAN message was received from control unit 'Combustion engine' or 'Transmission'. / C322000 No CAN message was received from control unit 'Transmission'. / C258600 No CAN message was received from control unit 'Combustion engine' or 'Transmission'.
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• Module: A1 - Instrument cluster (IC)​​​​​​​
• Fault(s): U010100 Communication with control unit "Transmission" has a malfunction.
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Any help is appreciated, I'm suspecting the problem is the CANs (Voltage Inverter, Distributor Blocks, etc.), there was no water damage...

 

The behavior of turning the car off and then on and it's back to normal for a while sounds like a conductor plate problem. It's interesting that you don't have any transmission codes from the TCU.

 

Has the interior of the car ever been wet? All those communication errors may be coming from a corroding canbus terminal.

 

It was my first thought, but since it's one of the newest versions (VGS3) and I can read the all the 3 sensors on it without any issue... It's not it (I think).

 

I've lifted the passenger side carpet (where a lot of wiring is) and it was dry, not humid at all. But I still haven't checked the driver side.

 

Well, the powering off and on is resetting something. I agree, you should see a TCU error.

You might want to run through the tests in XENTRY for each of those controllers.

 

I've done a few tests and resets on the controllers that reported errors. Car is driving worse due to shift and torque converter reset.

VGS still shows no faults, but I've noticed low voltage.


Also here's the low voltage:

 

I know these cars are temperamental when it comes to voltage supply, but I wouldn't think being off by 0.3V would cause these problems. Was the engine running when you hooked up XENTRY?

 

Engine was off that's why battery was 12.2V (Like in the image), but when driving it's usually between 13V and 14V due to alternator.

I'm completely at a loss of what the issue is... I've got to check the CANs under the driver seat this weekend.

 

Did you solve that problem? I have just same car and same problems and started after changing oils. I'm interested in the end result.

 

Would suggest trying a new battery (upon reading your initial post, not the voltage)

 

​​Have to test voltage.

 

I tested voltage and it was normal.

 

Hello,

I seem to have had the same problem as I just posted a thread on it.

I ended up changing the conductor plate (pre-coded) but now it wont indicate the gear what so ever and I am a little lost what to do next.

My car is a 2008 C63 115k miles with a VGS 2 conductor plate. But strangely I have plenty of TCM codes as below :

1405 : Communication with control unit "Transmission" has a malfunction.
U1108 : No CAN message was recieved from control uni "Engine control system"
U0155 : CAN communication with control unit "A1 (instrument cluster)" has a malfunction
U0415 : The CAN signals sent from control Unit "Traction System" are incomplete
U0141 : CAN communication with control unit "N73 (electronic ignition lock control unit)" has a malfunction
U0126 : CAN communication with control unit "N80 (steering column tube module control unit)" has a malfunction
U0164 : CAN communication with control unit "Air Conditioning" has a malfunction
U0121 : CAN communication with the traction system has a malfunction
U0100 : No CAN message was received from control unit "Engine Control System"
U0103 : No CAN message was received from control unit "N15/5 (Electronic selector lever module control unit)"

 

Hey guys,

Sorry I haven't updated this in a while.

The problem was the processor of the TCM:

• P0613 - The processor in control unit "Transmission" has a malfunction.

I've bought a Pre-Programmed VGS3 Plate and will work on installing it.

 

What does "pre-programmed" mean? Since the dealer will not sell you a new plate directly, you bought a used plate. You will still need to take it to the dealer to code it for your car. Alternatively, @BenzNinja may be able to do it.

 

All 722.9 transmissions require to be coded to your specific car AFTER installation. There are no "pre-coded" options. Someone may claim "pre-coded" but what does that mean? They erased previous coding? You still need to have it coded by the dealer, or maybe @BenzNinja can do it. I would check with him first since a BenzNinja membership gives you access to remote services like this.

 

Hey Jetta,


I've given them all the information of the existing VGS3 plate that's on my car via Xentry Diagnostics like VIN, CVN, SCN and EHS and they've virginized and programmed it into a repaired / upgraded VGS3.

I'm not going to pay 1000€+ for someone to program this, so I bought a "Pre-Programmed". I wish mine was a 722.6 (Plug & Play) model.

I just need to do the adaptation, which I can do using Xentry Passthru, but I haven't had time to drain the fluids and replace it yet.

 

Thanks for the clarification. However, it shouldn't cost 1000€+ to configure, or at least not here. But, providing all the coding to the seller is a prudent step. Please let us know your experience.

LOL, the 722.6 5-speed makes me jealous when it comes to fixing the tranny.

 

You're welcome.

Honestly I haven't talked with anyone here about programming one, the 1000€ mentioned is a quote someone was given at a Mercedes dealer, but I don't even have one on my island.

Hopefully it works

 

Whether @BenzNinja can help with this or not, you probably could use his services more than other people living near a Mercedes dealership. He has access to Mercedes servers online and can update your car's software, along with other things requiring access to Mercedes' servers. His services are more than just providing a good copy of XENTRY and WIS, he can actually help diagnose problems and fix things in code.

 

Solved:
I finally had time to fix the issue with my car.

1. Bought a Pre Programmed VGS3 plate from ebay (From USA) by giving all the old conductor plate's information;
2. Drained the transmission (Reused same brand new oil);
3. Took out the valve body + the old conductor plate;
4. Separated the valve body from the old plate;
5. Put the Valve Body together with the new plate;
6. Attached it to the Transmission again;
7. Plugged in the TCM connector;
8. Used Xentry PassThru to Disable Transport Protection, Personalize and Activate plate (Offline);
9. Teached the TCM how to shift gears;
10. Put the Transmission back together and Refilled it (Filter, Oil, Pan, etc.)
11. Car was shifting rough, had to do Upshift Adaptations;

Car is now working 100%, No overheating and No communication errors. Saved 1000€+ by doing it myself.

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