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2013 VW Golf TDI issues / Codes

928 Views 16 Replies 3 Participants Last post by  Jennesitah
So its been a few sordid months with my wife's TDI. Here's the history:

It started with hesitation and loss of power, and a blinking coil dash light. She took it in to a local mechanic and the second hand info I got was that there was "Something wrong with a flapper." My wife ordered a dieselgeek p2015 fix, and I helped get that installed last week, and thats when I got involved in this. After replacement, there really wasnt much of a change, so I pulled codes. We had a turbo Underboost code(P00AF, P0299), an EGR code (P0402), etc. Would not go over 2500 RPM. So after watching some of the vids on here, and based on the codes, I was thinking that the N75 or actuator was bad. I checked the vacuum system:

  • First from the pump...28" consistently
  • I checked the turbo vane actuator - held vacuum without loss.
  • Then the N75 - I dont have VCDS (it arrives Tuesday), but Tee'd up Vac gauges on the pump to N75 inlet, and in between the N75 and Turbo Vane Actuator. It was inconsistent when it called for vac, so we just replaced it (N75).

The N75 behaved much better after that. I cleared the codes, and went for a test drive. I was able to get RPM up to 4-5000, but I could still tell we werent normal power. Drove it hard to heat up the EGTs and came back to check codes. No more stored codes, but the original permanent codes were there, plus two pending/permanent codes. These may have been there originally as well, I'm not sure, as I didnt pull the codes at the start, but anyway, this is the latest:

Font Screenshot Technology Darkness Multimedia

- P0638 - From what I am reading is the Throttle Valve? just below the EGR valve. I've read some people clean them up, and some people replace them, and some people change the little plastic gears on them.

- P13D6 - from what I can find is a glow plug/Chamber Pressure sensor for Cyl #3. Its not a stored or permanent code, so I'm thinking this could be a misfire/lack of air issue from the other problem.

So on to the question: I'm trying to decide where to go from here given the following.

1) When I was testing the VNT vane actuator, the video says that it should start moving at 2-3" of vac ((y)) and hit the stop at around 15-18". I think this one is stopping at 12. Granted the cheap vac pump gauge could be off a bit and all good...just trying to decide if I need to pull and replace or re-adjust a bit...I'm leaning towardVNT is probably fine.

2) Yesterday I yanked the battery, airbox, Cooling fans (better access to the Throttle valve), and pipe all the way back to the turbo inlet. I also pulled the sleeve off the charge pipe, and while it seems a bit dirty in there, nothing like others that I've seen in pics.

I figured I would go ahead and drop the TV and check that the butterfly moves smoothly, and maybe even pop the cover and look at the gears. Any other advice on this? Should I pull the VNT Actuator and check the vanes, or just focus on the TV for now since we dont have any VNT codes anymore?

Sorry for how long it is....Thanks for any help offered.
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Look when vw fixed my recalls at about 172k I started getting the coil light, cylinder 3 crap too, loss of power I wouldn’t get past 50 mph and she’d slow down, it was that she would not do regenerations so because she was super clogged she wouldn’t have power, I went thru a lot of stuff for them to fix it make sure you print out the warranty for dieselgate cuz they tried to charge me for fixing it when they changed the catalytic converters, they should cover it for 42k make sure she does the regen after because after they changed all kind of stuff in my car including the motor itself she still didn’t regen and they were being buttholes about it I had to take it to another dealership who actually fixed the issue which was the cooling system She made it to 301k as of now and no issues whatsoever. Be prepared cuz they just kept giving me the car till I ran out of the warranty miles when they fixed it I was 1000 miles from it being over
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I bought this wireless scan tool off Amazon and there’s an android app for regens and since my issues started I would monitor the regens the app is 5 dollars and the scan tool was about 15 but I keep mine on all the time to make sure my old lady is running like she should it will show regen time and percent if it’s full or not, try to get it and drive it for awhile Mine regens every 230 or so miles but it will also tell you the distance in between regens so you can monitor it and make your own patterns. Don’t let them tell you your cars got too many miles to be fixed. I fought for my car since 2018-2021 and their ignorance and laziness gave me a new motor, Dpf, fuel pump, intercooler the only thing they couldn’t change were my coolant tubes and tranny 🤣🤣🤣🤣 good luck to you let me know how it goes, sorry I had to share my story cuz they’re so dumb my car didn’t regen because the cooling system wouldn’t create enough pressure or whatever to do the regen process so till this day I am sure all those things that they changed was for nothing, well a gift for their ignorance and it kept giving the same code no matter what they did and they did allot they used to say I was just trying to get free parts.
Just cuz I’m a girl
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