The dreaded 7G-Tronic TCM plate failure
09-25-2023, 02:07 PM
#1
Newbie
Thread Starter
The dreaded 7G-Tronic TCM plate failure
Hello everyone,
I bought myself a nice CLK 320 CDI a few months ago. With almost all options, the color I wanted and everything, so it was a no brainer for me considering it's always been my dream car.
However, a couple of weeks ago, the car stopped shifting while I drove it, and everything went back to normal after a restart. I checked the codes, and of course, it was the dreaded TCM sensor fail with the following codes on DAS :
On CDI4 controller
2230-001 Transmission control ETC FAULT 13
2297-001 Transmission control ETC short-circuit to positive
On EGS controller
2768 Component Y3/8n1 (Internal speed sensor (VGS)) is defective.
2767 The signal from component Y3/8n1 (Internal speed sensor (VGS)) is not available.
So there's no doubt it's a conductor plate issue.
I found tons of repair services for those nearing the 300 EUR mark, with new plates being around 400-500 EUR.
But I was wondering, what is actually done to these plates to refurbish them ? Is it micro-soldering new chips or resoldering connections, just a sensor change, etc ?
Is the repair actually worth that much, or is it doable semi-DIY ? I have extensive knowledge in electronics due to being an engineer, but not much in the field of car-related electronics.
Thank you
Lazarev8ch
I bought myself a nice CLK 320 CDI a few months ago. With almost all options, the color I wanted and everything, so it was a no brainer for me considering it's always been my dream car.
However, a couple of weeks ago, the car stopped shifting while I drove it, and everything went back to normal after a restart. I checked the codes, and of course, it was the dreaded TCM sensor fail with the following codes on DAS :
On CDI4 controller
2230-001 Transmission control ETC FAULT 13
2297-001 Transmission control ETC short-circuit to positive
On EGS controller
2768 Component Y3/8n1 (Internal speed sensor (VGS)) is defective.
2767 The signal from component Y3/8n1 (Internal speed sensor (VGS)) is not available.
So there's no doubt it's a conductor plate issue.
I found tons of repair services for those nearing the 300 EUR mark, with new plates being around 400-500 EUR.
But I was wondering, what is actually done to these plates to refurbish them ? Is it micro-soldering new chips or resoldering connections, just a sensor change, etc ?
Is the repair actually worth that much, or is it doable semi-DIY ? I have extensive knowledge in electronics due to being an engineer, but not much in the field of car-related electronics.
Thank you
Lazarev8ch
09-26-2023, 03:56 PM
#2
Senior Member
Where can you buy new for 400-500Euro?
From mercedes, only genuine part supplier, they are well over 1000Euro, plus programming!
They are part of the security system on the car, and only Mercedes can code them (and a few hackers!)
The reason they are repaired is to save re-coding them.
They generally are jut cleaned (ultrasonically) and valves / turbines replaced. They rarely fail electronically. If you get one refurbished, take it to a reputable company, as if it is electronically damaged there is more chance they will still be able to help you
From mercedes, only genuine part supplier, they are well over 1000Euro, plus programming!
They are part of the security system on the car, and only Mercedes can code them (and a few hackers!)
The reason they are repaired is to save re-coding them.
They generally are jut cleaned (ultrasonically) and valves / turbines replaced. They rarely fail electronically. If you get one refurbished, take it to a reputable company, as if it is electronically damaged there is more chance they will still be able to help you
