[romanoaf]

Hoping someone has seen this type of issue before.
14' Touareg 3L tdi (malone stg2 with deletes, EGR software closed)
started going into limp mode intermittently a week ago, scanned with VCDS, pulled "P0128 00 [096] - Temperature below Control Range Intermittent - Not Confirmed" it's been cold out so I typically wouldn't think anything of this if it's slow to get to temp.
Cleared the code, lifted limp mode. I wouldn't think an open thermostat would throw limp mode but it is a "map controlled" thermostat so it's possible the ECM reads position. (I have one on order)

Next day limp mode again, scanned with VCDS; clean, no codes, temp or permanent. However when I clear the codes, it lifts limp mode again. The car feels healthy when I clear the codes (even though none are logged).
In the mean time I changed the air filter, fuel filter and MAF to no effect. I will say the car is less likely to start off in limp mode if it's warm.
The car is limp from cold start, immediately when taking off, so its unlikely that it cutting out with over boost, fuel pressure reading maybe?.

Logged boost, looks normal.
Logged air mass, actual value was a somewhat higher than specified so I replaced it with OEM.
Logged High pressure fuel, generally within 5%, but there are some momentary -20% deltas but I might consider that normal with deceleration.

The most frustrating part is that I don't know if there's anything I can do to read which sensor or reading is causing the state, with VCDS.
I can't find any diagnostic instructions for this condition in ETKA, I'm hoping someone here knows the ECM Limp mode logic.
TIA

 

[volkswagens-for-life]

Take it in and let the extended warranty repair it


Ohhhhhh wait 🤣🤣🤣


Anywho, there are often soft codes that are triggered that vagcom Will not pick up but the dealership can

 

[Newegg]

I had a similar issue on my 2012.TDI. We ended up re installing the factory tune so we could see what the code was. Turned out to the differential pressure sensor, its on the firewall behind the turbo. It needed to be unplugged.

Limp mode sucks.

 

[romanoaf]

I had a similar issue on my 2012.TDI. We ended up re installing the factory tune so we could see what the code was. Turned out to the differential pressure sensor, its on the firewall behind the turbo. It needed to be unplugged.

Limp mode sucks.

Thanks, that’s very useful info.. Malone didn’t indicate to me that this was possible when I contacted them, only to log boost and fuel.. it makes sense considering the car drives healthy once limp is lifted.

 

[volkswagens-for-life]

I had a similar issue on my 2012.TDI. We ended up re installing the factory tune so we could see what the code was. Turned out to the differential pressure sensor, its on the firewall behind the turbo. It needed to be unplugged.

Limp mode sucks.

There is no correlation between a tune and viewing a code. Also every time you flash that ECU the flash count goes up and the likelihood of the dealership terminating warranty or refusing to work on it goes up

 

[SaVAGeSoot]

There's no increase chance of a TD1 designation if you have a lower flash count vs a higher one... as soon as it doesn't match the motherland record, you're TD1..... so you're already rolling the dice with your very first tune if you still have warranty.

 

[volkswagens-for-life]

There's no increase chance of a TD1 designation if you have a lower flash count vs a higher one... as soon as it doesn't match the motherland record, you're TD1..... so you're already rolling the dice with your very first tune if you still have warranty.

That's true, but td1 can be issued from motherland directly or locally by the dealership. If they see it off by 1 or 2 counts a local dealer may not but start stacking up flash counts and the local dealer is gonna be scratching his balls wondering what's going on

 

[SaVAGeSoot]

I disagree based on what I've read

The TD1 warranty key is automatically 'flagged' by the dealerships diagnostic equipment. Not all vehicles are part of this automatic detection, however the ones that are detected, the dealership will not know this process is happening. Oh, by the way, the warranty Key TD1 is irrevocable and can not be added manually.

 

[volkswagens-for-life]

I disagree based on what I've read

I've read the OG of td1 on Audizine from many moons ago. Td1 can be manually flagged at any time locally BUT yes it's true that motherland can flag and the local not even know it happens

 

[SaVAGeSoot]

You should call VAG and tell them to fix their documentation in that case.

 

[volkswagens-for-life]

You should call VAG and tell them to fix their documentation in that case.
View attachment 249827

What you posted corroborates with my statements

 

[SaVAGeSoot]

What you posted corroborates with my statements

It does?

I've read the OG of td1 on Audizine from many moons ago. Td1 can be manually flagged at any time locally BUT yes it's true that motherland can flag and the local not even know it happens

This detection runs automatically in the background during the normal diagnostic process. If unauthorized engine tuning is detected, a “TD1” code is automatically populated within the Warranty Key section of Elsa (Figure 1). This warranty code cannot be manually added or removed. Not every tuned vehicle will be detected automatically; however, selected vehicles can be checked for unauthorized ECM software if an ECM software specified vs. actual comparison is performed.Maybe I can't read!

 

[volkswagens-for-life]

It does?

You're referring to ECU only. I'm referring as a whole td1 can be manually input for other systems. Td1 doesn't ONLY refer to ECU.

 

[SaVAGeSoot]

I'm not sure why you insist on spreading misinformation even when I'm providing actual evidence of why what you are claiming isn't true regardless of what you've read somewhere, long time ago, etc.

https://static.nhtsa.gov/odi/tsbs/2014/MC-10124823-9999.pdf

Please provide some actual documentation if we are going to keep arguing about this.

 

[volkswagens-for-life]

I'm not sure why you insist on spreading misinformation even when I'm providing actual evidence of why what you are claiming isn't true regardless of what you've read somewhere, long time ago, etc.

https://static.nhtsa.gov/odi/tsbs/2014/MC-10124823-9999.pdf

Please provide some actual documentation if we are going to keep arguing about this.

Quoting a technical publication that's over a decade old? Gotta do better than that. I'm getting my information from a vag tech that's been deep in the vag systems for years that has intimate knowledge with how td1 works. The fact of the matter is, there isn't any public facing documentation describing how their proprietary information and internal systems works.


But, if you were forcing me and twisting my arm and I had to use the information you provided, I have cropped the information that backs exactly what I'm saying.

Do you even read what's in link's you provide before posting them?

 

[romanoaf]

When inspecting MAP sensor, noticed it was covered in oil. Ended up draining 500ml of oil from the intercooler piping, and swapping the sensor.
This has corrected the limp condition.
Looks like I’ll be installing a catch can in the near future.

 

[volkswagens-for-life]

A few hundred ml is typical. Has nothing to do with a catch can more than likely. You're driving an oil burner rofl

 

[SaVAGeSoot]

You're referring to ECU only. I'm referring as a whole td1 can be manually input for other systems. Td1 doesn't ONLY refer to ECU.

Actually, it does just that exactly!

I'm referring as a whole td1 can be manually input for other systems. Td1 doesn't ONLY refer to ECU.

Wrong again!

I repeat!

Please provide some actual documentation if we are going to keep arguing about this.

Quoting a technical publication that's over a decade old? Gotta do better than that. I'm getting my information from a vag tech that's been deep in the vag systems for years that has intimate knowledge with how td1 works. The fact of the matter is, there isn't any public facing documentation describing how their proprietary information and internal systems works.

Until the revision table on the official VAG documents says revision "X - Superseded by whatever some unnamed source that has been deep in vag systems for years with intimate knowledge claims", the TSB is still relevant regardless of how old it is. If you insist on telling stories, that's fine, but I won't accept them over actual documentation. Others are free to make their own decisions.

But, if you were forcing me and twisting my arm and I had to use the information you provided, I have cropped the information that backs exactly what I'm saying.

View attachment 249829

The problem is, you don't understand the difference between ECM Tuning and Powertrain Tuning.
Read the very bottom of that screen shot again, where it directs the tech to initiate a software comparison check.
There are quite a few other warranty keys that can be applied due to various mods, etc. Here's a few:

Do you even read what's in link's you provide before posting them?

I do, but unlike you, I actually comprehend them before arguing to death about something that's not true! 😋

Lastly, tell you what.... since you have such in-depth correct knowledge of how incorrect everything I'm posting on this subject is, do the following to really shut me up.

Get your VAG tech guy to apply a TD1 flag to your VIN. He can do this either by allegedly manually setting the flag (which is not possible), or by running the specified vs actual software compare on the ECU. Once you get flagged TD1, get him to remove the flag (which is also not possible) and all this will prove that I am fabricating everything I've said and it's total bologna.

Anyways, since I know this won't happen, I'm going to gracefully bow out of this beating of the dead horse as we've severely hijacked the OP's tread and the most important thing is the fact that he was able to isolate and fix his issue.

Good on you @romanoaf

 

[volkswagens-for-life]

Dude, it literally says powertrain tuning includes chipping, piggybacking, flashing, And then it says a code must be entered manually right below it. Seriously. Reread the screenshot I took of the documentation you provided.
That said, I'm definitely not going to play with fire and the TD1 because I already Play with enough fire with the dealerships 😂

 

[romanoaf]

Anyways, since I know this won't happen, I'm going to gracefully bow out of this beating of the dead horse as we've severely hijacked the OP's tread and the most important thing is the fact that he was able to isolate and fix his issue.

Good on you @romanoaf

Thanks, I wanted to close the loop for others in the same position.
I'm not too active on here, but I'm glad there's an "ignore" function on this forum.