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Discussion Starter #1
Hello everyone. We bought our 2012 VW EOS a little over a year. We have taken it to the dealer for them to check to see what is causing this issue. We will be driving and the car’s traction light comes on, check engine, steering wheel come on. When all these lights come in the transmission goes into neutral. If we put the car in park the shifter locks up. We have to turn off the car and turn it on a few times and it will reset itself. I had a mechanic put the code reader on it and it gave us a lost communication with TCM. The dealer cannot get it to duplicate the problem. I did take the center console apart to clean it good and noticed there was dried up soda or coffee on the floor inside the console. Any help would be greatly appreciated. Thank you all in advance. I would hate to have to get rid of this car.
 

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Intermittent faults are the hardest to find because a technician needs the fault to be present when they are tracing a problem. Unfortunately, these days connecting diagnostics and not finding a problem (at the time) can be their quick reply to get a car out of the workshop.

At the very least I would have expected the service tech. to have located the TCM control module and wiggle the wiring and connector about after clearing the fault code to see if it returns? If you Google you will find several related issues about intermittent connector/wiring. I don't have a TCM or know exactly where it is, but if it is outboard, sealed and on the transmission exposed to weather (or coffee), I would look there first. There is always the possibility of a module fault too and you might be able to bring that on by warming the module with a hair dryer. You may not have diagnostics, but the dash seems to be a good indicator for you. They will be very lucky if they can find something positive but at the very least I would expect them to clean the connectors? The warning lights you get sound right for a non-working TCM controller. You get similar dash light 'surprises' when ABS fails.

Unless your EOS is in a warranty I think after checking wiring and connectors as DIY and not finding anything, if the fault came back I might consider buying a used TCM module and fitting it myself to save on shop prices for new parts and labor. Be careful to get the correct compatible part by looking at the part numbers and date on your module. If the same fault comes back, you are looking for wiring or other faults.
 

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Discussion Starter #3
Thank you for your response. I have taken the connector off and checked the wires and connection. Since they cannot get the car to duplicate the problem they will not tell me if it is the TCM. The bad thing about this car is that the TCM is part of the Megatronic unit that goes inside the transmission. Could it be the canbus/gateway. On the dash the traction control says error on dash. And it clears up. I am going to take it to my mechanic to see if he can pinpoint the problem so I can fix it. The bad thing about DYI and YouTube none of them actually work on the EOS more on Jetta and golf. I was hoping to see get some inside of another owner that may have gone through this. Again thank you.
 

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Discussion Starter #4
Thank you for your response. I have taken the connector off and checked the wires and connection. Since they cannot get the car to duplicate the problem they will not tell me if it is the TCM. The bad thing about this car is that the TCM is part of the Megatronic unit that goes inside the transmission. Could it be the canbus/gateway. On the dash the traction control says error on dash. And it clears up. I am going to take it to my mechanic to see if he can pinpoint the problem so I can fix it. The bad thing about DYI and YouTube none of them actually work on the EOS more on Jetta and golf. I was hoping to see get some inside of another owner that may have gone through this. Again thank you.
I have also moved the connector while it is running and nothing. The car works good for a while and then it will do this.
 

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I can understand your frustration because I once had a new works car that would intermittently stall on decel. at road junctions, something I thought very dangerous. It was in and out the service shop changing all things but never got 100% fixed, although they had it happen once and knew the fault was real.

There is a lot of talk about Mechatronic units, but not about intermittent operation and the internet won't help much with intermittent faults. Workshops are pretty dumb too. They rely mainly on built in diagnostics and do not have extensive electronic engineering fault finding skills. E.g a higher level technician or engineer could look at CANbus signals, even install a CAN monitor to capture bad events when they happen which the built in diagnostics may not, but this is a specialist area. For now, workshops with doubts will usually advise replacing parts with new, but this can be an expensive way to solve an intermittent fault. If this is suggested and more than one part is suspect, try the cheapest option first.
 

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Discussion Starter #6
Thank you really appreciate you. I will be taking it to my VW mechanic and he is going to look I to it. Hopefully he finds what is wrong. Have a great one.
 

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Is the dealer a VW franchised dealer? Anyway, sounds like you have a VW mechanic so they will be more familiar with the car and its issues.

It sounds like the classic issue with DSG transmissions, be assured that reconditioned mechatronics units have come down in price a little. Also, do you have FSH and the car is <100k?
 

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Discussion Starter #8
The dealership is a VW dealer. My mechanic said that it is the mechatronic unit needs to be replaced. Not sure what FSH is? Please advise. And the car is at 109k

Thank you for your input. Will wait for your response. Have a great day. Really appreciate your help aldo
 

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Full Service History.

I believe VW extended the warranty on the transmission to 100k miles, but yours is out of it. Aftermarket replacement mechatronic it is.
 

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Discussion Starter #10
Thank you for your help. My mechanic is purchasing part from dealer. I was quoted $1105.99 for part myself. More than certain he will have to pay less.
 
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