2016 Passat Electrical Firestorm

[Polska111]

Hey guys!

Got a 2016 Passat Alltrack with demons.

About 2 weeks ago my car started throwing every electrical system error under the sun. It would do it on ignition power, and only do it 1 in every 30-50 starts.

Each time it happened, Id turn the ignition off, attempt to restart the car and it'd start, run and drive no problem.

It was previously only doing this at ignition at startup, however today it did it mid drive and switched off in the middle of a highway.

Ive got a few small elec issues Im aware of (front air distribution servo, windshield washer pump motor), but this is a mess, and no shop is available to diagnose it for nearly a month.

Some errors I keep seeing in my logs are "Databus message missing/implausible/error value received" (across all literally every control unit), and "Lost Communication with ECM/PCM", which suggests to me either canbus or ECU?

Any ideas?

You can see the full error log at:

Dropbox

TIA!http://cloud.tapatalk.com/s/678f752e...BD11%20Log.pdf

Sent from my Pixel 5 using Tapatalk

[BeigeJet]

Have you tried any local independent VW specialists in your area.

If not may be worth a try at Volkscare in Bayswater. Boris is the owners name.

They've been very helpful in the past with our 2006 Jetta TDI

[Polska111]

Have you tried any local independent VW specialists in your area.

If not may be worth a try at Volkscare in Bayswater. Boris is the owners name.

They've been very helpful in the past with our 2006 Jetta TDI

I usually take it to Peninsula Autohaus in Frankston but earliest they can do is early Feb, but Im gonna dona whip around tomorrow and see if anyone can book me in sooner.

Sent from my Pixel 5 using Tapatalk

[hulbyw]

Volkscare or Volkwerke in Doncaster. Both good shops

[DV52]

@Polska111. Hi.

Hmm....... obviously from your pictures, there are multiple-problems with this car! If we could actually see the content of your OBD11 scan - stuff would be much clearer!!

Maybe first add Freeze-frame to your OBD11 account (read THIS) - then make a fresh SCAN and post-up (make sure that it actually works)

Don

[Gutoneto]

Hey guys!

Got a 2016 Passat Alltrack with demons.

About 2 weeks ago my car started throwing every electrical system error under the sun. It would do it on ignition power, and only do it 1 in every 30-50 starts.

Each time it happened, Id turn the ignition off, attempt to restart the car and it'd start, run and drive no problem.

It was previously only doing this at ignition at startup, however today it did it mid drive and switched off in the middle of a highway.

Ive got a few small elec issues Im aware of (front air distribution servo, windshield washer pump motor), but this is a mess, and no shop is available to diagnose it for nearly a month.

Some errors I keep seeing in my logs are "Databus message missing/implausible/error value received" (across all literally every control unit), and "Lost Communication with ECM/PCM", which suggests to me either canbus or ECU?

Any ideas?

Ive uploaded the full log as a .PDF.

TIA![ATTACH]56276[/ATTACH][ATTACH]56277[/ATTACH][ATTACH]56278[/ATTACH][ATTACH]56279[/ATTACH][ATTACH]56280[/ATTACH][ATTACH]56281[/ATTACH]http://cloud.tapatalk.com/s/678f752e...BD11%20Log.pdf

Sent from my Pixel 5 using Tapatalk

The log link it's not working. Could you please post here?

I think your problem is related to the gearbox. All those system relies on signals from the TCU to work. When my TCU was dying I had all those random errors on the MFD as well, but won't be able confirm until see the logs.

Is your Alltrack 6 or 7 speed?

[Polska111]

Hey guys, thanks foe the replies!

Ive uploaded the log as a txt doc here:

Dropbox


Sent from my iPad using Tapatalk

[Polska111]

@Polska111. Hi.

Hmm....... obviously from your pictures, there are multiple-problems with this car! If we could actually see the content of your OBD11 scan - stuff would be much clearer!!

Maybe first add Freeze-frame to your OBD11 account (read THIS) - then make a fresh SCAN and post-up (make sure that it actually works)

Don

Hey Don, Ive uploaded the txt log here:

Dropbox

Thanks for the reply!


Sent from my iPad using Tapatalk

[Gutoneto]

You have two lost of communication with the TCU and I would start with that. As mentioned, that can cause an avalanche of erros on all the other modules/systems.

U010000 - Lost Communication with ECM/PCM 

Intermittent 

U010000 - Lost Communication with ECM/PCM 

Intermittent

Have you checked if you have any oil coming out of the mechatronic connector?

[Polska111]

You have two lost of communication with the TCU and I would start with that. As mentioned, that can cause an avalanche of erros on all the other modules/systems.

U010000 - Lost Communication with ECM/PCM 

Intermittent 

U010000 - Lost Communication with ECM/PCM 

Intermittent

Have you checked if you have any oil coming out of the mechatronic connector?

I dropped the car in this morning so Im unable to check, but I haven’t noticed any oil spots on the drive nor under the vehicle.

Where would I find the TCU and connector? I cant seem to find much on location online.


Sent from my iPad using Tapatalk

[Guest001]

Failing battery can cause light shows like that

[Polska111]

Failing battery can cause light shows like that

My thought too, but got battery tested and was all ok.


Sent from my iPad using Tapatalk

[Guest001]

My thought too, but got battery tested and was all ok.


Sent from my iPad using Tapatalk

Had similar wouldnt hurt to try another one to see Fixed mine and it tested fairly OK

[DV52]

@Gutoneto: Hi again - are you settled-in yet? Hope everything is OK in your new abode!

Hmm........ no offense and maybe I'm reading a different SCAN, but I suspect that your interpretation of the U010000 errors is a tad erroneous. Yes, the 2 x error messages have been recorded in the 02 module - but again with no offense intended, the story they tell me is that the culprit here is perhaps the 01 module (not the TCU).

My reading of these errors is supported by the fact that the Gateway module has also recorded the same U010000 error.
So, my hunch is that this problem may have its genesis in the 01 module's ability to remain in continuous communication with the central CAN spine on this car - I think!

The "usual" reason for module comms failures is either a problem with the CAN high/low wires (open/short circuit), or a power supply problem. The intermittent status of the errors on this car suggests that perhaps a multi-meter and a wiring diagram might be useful as a prelude to focused diagnostic testing (dependent on OP's answer to my question below).

@Polska111: Please confirm that the Engine Control Unit (ECU) on this car is factory original and that there have been absolutely NO (meaning "none") coding changes to this car.

Alas, there is NO Freeze-frame data in your SCAN as I requested. Clearly you have chosen to post-up yesterday's SCAN - which is entirely your prerogative, of course! The missing data greatly restricts how the story-line in your SCAN can be read -so I can't comment except to reiterate that it would help to have Freeze-frame data (especially given the multitude of errors on this car)!!

Anyhow -do the following (if you want):

1. Enable Freeze-frame as I requested and make a fresh SCAN.
2. Then clear ALL errors and cycle the ignition (without the engine running) - do the errors re-appear?
3. Then start the engine - do the errors re-appear?

Don

[Polska111]

2016 Passat Electrical Firestorm

@Gutoneto: Hi again - are you settled-in yet? Hope everything is OK in your new abode!

Hmm........ no offense and maybe I'm reading a different SCAN, but I suspect that your interpretation of the U010000 errors is a tad erroneous. Yes, the 2 x error messages have been recorded in the 02 module - but again with no offense intended, the story they tell me is that the culprit here is perhaps the 01 module (not the TCU).

My reading of these errors is supported by the fact that the Gateway module has also recorded the same U010000 error.
So, my hunch is that this problem may have its genesis in the 01 module's ability to remain in continuous communication with the central CAN spine on this car - I think!

The "usual" reason for module comms failures is either a problem with the CAN high/low wires (open/short circuit), or a power supply problem. The intermittent status of the errors on this car suggests that perhaps a multi-meter and a wiring diagram might be useful as a prelude to focused diagnostic testing (dependent on OP's answer to my question below).

@Polska111: Please confirm that the Engine Control Unit (ECU) on this car is factory original and that there have been absolutely NO (meaning "none") coding changes to this car.

Alas, there is NO Freeze-frame data in your SCAN as I requested. Clearly you have chosen to post-up yesterday's SCAN - which is entirely your prerogative, of course! The missing data greatly restricts how the story-line in your SCAN can be read -so I can't comment except to reiterate that it would help to have Freeze-frame data (especially given the multitude of errors on this car)!!

Anyhow -do the following (if you want):

1. Enable Freeze-frame as I requested and make a fresh SCAN.
2. Then clear ALL errors and cycle the ignition (without the engine running) - do the errors re-appear?
3. Then start the engine - do the errors re-appear?

Don

As the vehicle is currently at the shop I cannot conduct a scan, however, the ECU is original, and has 1 minor coding change which was to enable paddles (as I had a steering wheel swap).

Forgive my newbieness,but what is the 01 Module, the ECM/ECU?

Now that think of it, this issue did first arise after I did a “disable safety disclaimer” code change (via an obd11 app) which I have since reversed. I could not imagine how this could have been the cause however being such a basic on/off code change.

I did not have the vehicle to re-scan with freeze frame, however if they are unable to diagnose the issue or if they are unable to do it within a reasonable time I will go back and re-scan with FF enabled. I was unaware this was a feature until I had posted in here, so thank you to all who have recommended enabling it!


Sent from my iPad using Tapatalk