2007 320 cdi transmission issues
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 27
Likes: 2
GL320 cdi
2007 320 cdi transmission issues
What happens:
transmission shifts well when having no issues, but may "get stuck" when driving. Car almomst stalls/stops, and then goes into limp. It almost feels like it it puts itself in P while driving.
I am using Delphi software for diagnostics. I am including last 2 tranny readings and my last engine codes as well.
-I seem to have permanent C144 and always speed sensor related codes.
-also steering column related codes.
-lots of other stuff...
Please see codes below.
Opinions/Direction/ Help?
Thanks:
Latest readings:
Gearbox (Gearbox - 7G-Tronic (Gearbox) - AT) DTC Description
C114 - No Communication with Transfer Case Control Module - Permanent
0894 - Gear is implausible or the transmission is slipping - Intermittent
0722 - Gearbox output speed sensor; no signal - Intermittent
0723 - Speed sensor output - Intermittent:
Previousl Readings:
Gearbox (Gearbox - 7G-Tronic (Gearbox) - AT)
DTC Description C114 - No Communication with Transfer Case Control Module - Permanent
0722 - Gearbox output speed sensor; no signal - Intermittent
C155 - No or incorrect CAN message from control unit Instrument cluster - Intermittent
C126 - No CAN message was received from control unit steering column module - Intermittent
D139 - No CAN message was received from control unit steering column module - Intermittent
C141 - Fault in CAN communication with central gateway - Intermittent
0723 - Speed sensor output - Intermittent
0894 - Gear is implausible or the transmission is slipping - Intermittent
Latest engine readings:
Diesel (642.940 - CR4 - MT/AT - 164.822)
DTC Description No fault codes
2296 - Transmission control ETC; short circuit to ground - Intermittent
2229 - Transmission Control: ETC fault - Intermittent
2232 - Transmission Control: ETC fault - Permanent
2355 - Exhaust gas recirculation, air mass is too small - Intermittent
transmission shifts well when having no issues, but may "get stuck" when driving. Car almomst stalls/stops, and then goes into limp. It almost feels like it it puts itself in P while driving.
I am using Delphi software for diagnostics. I am including last 2 tranny readings and my last engine codes as well.
-I seem to have permanent C144 and always speed sensor related codes.
-also steering column related codes.
-lots of other stuff...
Please see codes below.
Opinions/Direction/ Help?
Thanks:
Latest readings:
Gearbox (Gearbox - 7G-Tronic (Gearbox) - AT) DTC Description
C114 - No Communication with Transfer Case Control Module - Permanent
0894 - Gear is implausible or the transmission is slipping - Intermittent
0722 - Gearbox output speed sensor; no signal - Intermittent
0723 - Speed sensor output - Intermittent:
Previousl Readings:
Gearbox (Gearbox - 7G-Tronic (Gearbox) - AT)
DTC Description C114 - No Communication with Transfer Case Control Module - Permanent
0722 - Gearbox output speed sensor; no signal - Intermittent
C155 - No or incorrect CAN message from control unit Instrument cluster - Intermittent
C126 - No CAN message was received from control unit steering column module - Intermittent
D139 - No CAN message was received from control unit steering column module - Intermittent
C141 - Fault in CAN communication with central gateway - Intermittent
0723 - Speed sensor output - Intermittent
0894 - Gear is implausible or the transmission is slipping - Intermittent
Latest engine readings:
Diesel (642.940 - CR4 - MT/AT - 164.822)
DTC Description No fault codes
2296 - Transmission control ETC; short circuit to ground - Intermittent
2229 - Transmission Control: ETC fault - Intermittent
2232 - Transmission Control: ETC fault - Permanent
2355 - Exhaust gas recirculation, air mass is too small - Intermittent
MBWorld Fanatic!
Joined: Jan 2010
Posts: 3,114
Likes: 782
NGL450 w/EORP, S550
If you Google vehicle speed sensor and 7G, you’ll find that this is a component that usually fails with age. When it fails, it’ll go to a limp home mode, locking the car in second gear or the gear it is in when the failure occurs.
I’m inclined to believe that all the other codes are resulting from this being the root cause issue.
There are third-party solutions that could make this a $350 DIY, and there are dealer solutions that’ll make those a $3500 dealer only repair if you listen to their spiel.
The question is, do you really want to spend that much money on a CDI that’s going to throw all kinds of other life altering problems at you.
I’m inclined to believe that all the other codes are resulting from this being the root cause issue.
There are third-party solutions that could make this a $350 DIY, and there are dealer solutions that’ll make those a $3500 dealer only repair if you listen to their spiel.
The question is, do you really want to spend that much money on a CDI that’s going to throw all kinds of other life altering problems at you.
MBWorld Fanatic!
Joined: Jan 2010
Posts: 3,114
Likes: 782
NGL450 w/EORP, S550
I don’t know if your system can do that. If you don’t have a system that can do that there are third parties on the Internet who can code the new contactor plate to your car so then all you need to do is install the new contactor plates onto your old valve body, reassemble and refill the transmission fluid. The dealer will tell you that this is a theft prevention feature that locks the transmission to a car for its lifetime, and they are the only ones who can legally do it. Here in the US, we call bull**** on that.
Senior Member
Joined: Aug 2018
Posts: 409
Likes: 121
From: Kelowna, BC
08 GL320 CDI
I've had my CDI for about 5 years now and its been an amazing vehicle. We tow our trailer with it camping all the time and its the wifes daily driver. Its been pretty much trouble free overall. very happy with my first Benz product.
The fuel efficiency of the diesel is amazing. Coming from a long VAG background, I'm impressed with it.
...Would buy again...
Last edited by Sallad; Apr 10, 2023 at 03:28 AM.
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 27
Likes: 2
GL320 cdi
you buy a contactor plate set up and copy your existing contactor plates vin coding over to the new one using offline coding in Das / Mb Star / xentry.
I don’t know if your system can do that. If you don’t have a system that can do that there are third parties on the Internet who can code the new contactor plate to your car so then all you need to do is install the new contactor plates onto your old valve body, reassemble and refill the transmission fluid. The dealer will tell you that this is a theft prevention feature that locks the transmission to a car for its lifetime, and they are the only ones who can legally do it. Here in the US, we call bull**** on that.
I don’t know if your system can do that. If you don’t have a system that can do that there are third parties on the Internet who can code the new contactor plate to your car so then all you need to do is install the new contactor plates onto your old valve body, reassemble and refill the transmission fluid. The dealer will tell you that this is a theft prevention feature that locks the transmission to a car for its lifetime, and they are the only ones who can legally do it. Here in the US, we call bull**** on that.
MBWorld Fanatic!
Joined: Jan 2010
Posts: 3,114
Likes: 782
NGL450 w/EORP, S550
I don't get this statement.
I've had my CDI for about 5 years now and its been an amazing vehicle. We tow our trailer with it camping all the time and its the wifes daily driver. Its been pretty much trouble free overall. very happy with my first Benz product.
The fuel efficiency of the diesel is amazing. Coming from a long VAG background, I'm impressed with it.
...Would buy again...
I've had my CDI for about 5 years now and its been an amazing vehicle. We tow our trailer with it camping all the time and its the wifes daily driver. Its been pretty much trouble free overall. very happy with my first Benz product.
The fuel efficiency of the diesel is amazing. Coming from a long VAG background, I'm impressed with it.
...Would buy again...
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Newbie
Joined: Jan 2025
Posts: 1
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Distronic, Mercedes-Benz's adaptive cruise control system, is a sophisticated feature that enhances safety and convenience. However, the "external fault" message typically indicates a problem with the radar sensor or its calibration. Here’s a detailed guide to address this issue:
- Inspect the Radar Sensor:
Check the front grille where the radar sensor is located. Dirt, debris, or damage can interfere with its functionality. Cleaning the sensor gently with a microfiber cloth might resolve minor issues. - Verify Alignment and Calibration:
If the sensor was misaligned due to impact or repair work, it needs to be recalibrated. This requires specialized tools and is best done by a Mercedes-Benz service center. - Check for Electrical Issues:
The external fault might stem from wiring problems or a malfunction in the control module. A diagnostic scan using an OBD-II tool specific to Mercedes-Benz can help identify error codes for a more precise diagnosis. - Software Update:
Outdated software might cause communication errors between the Distronic system and the vehicle. Ensuring your car's software is up-to-date can often fix these glitches. - Seek Professional Assistance:
If the above steps don’t resolve the issue, it’s advisable to visit a certified Mercedes-Benz technician. They have the expertise and tools to diagnose and repair complex Distronic faults. - For storing vehicle service records, diagnostic reports, and technical manuals, TeraBox MOD APK offers an excellent solution. With unlimited storage, you can keep all your car-related documents safe and accessible whenever needed!
Last edited by Rodela123; Jan 19, 2025 at 05:33 AM.
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Super Member
Joined: Jul 2016
Posts: 701
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From: NE OHIO
1998 SL500,2011 GL550,2009 ML350,past 1995 E320 Cabrio ,2005 ML500,2006 ML500,1996 SL500,1972 280SEL
DIY
if you decide to go the diy route.. search my write ups for changing all of the O-rings on the 8 shift solenoids also when you drop the valve body. There are some decent places to send the electronics to have the speed sensors replacement and the board tested also.
