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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old August 12th, 2019, 06:36   #16
thundershorts
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The pump sound changed on mine as it was failing, became louder. The new pump was very quiet, almost inaudible with seat in place instead of the the noticeable hum.
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Old August 12th, 2019, 09:43   #17
USMCFieldMP
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Originally Posted by Owain@malonetuning View Post
Most likely boost related limp mode, best to hook up a vcds cable and investigate.
This is what mine has shown.

- - -

This has happened to me a handful of times. It's typically within 5 minutes of starting the car as I'm getting on the highway. I just cycle the key OFF-ON and it goes away.

I did read it with a VCDS once and I only showed a pending code related to boost pressure; no active code.



My thought on it has been that the turbo is cold and therefore takes longer to spool, but once the exhaust pressure builds up enough to get it moving, it spikes hard. Cold turbo boost gain having more of a exponential gain (right graph below) which is harder to control at its peak, versus a hot turbo which has more of a logarithmic gain (left graph). I haven't logged it to confirm, but this is just my educated guess as a mechanical engineer.

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Old August 14th, 2019, 11:46   #18
Smashed Ixnay
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And what is the car doing now? What was issue?

The car has been working fine every since they finally fixed the issue. I did just get a CEL come on, but they are going to replace my adblue tank via the warranty. This has nothing to do with my original problem you are now having.


As far as I know it was a wiring issue coming from one of the dpf sensors that burnt on my hood. Originally they only went about 12Ē from the sensors, but after more time their they dig down farther and found the issue.


Iím not sure if itís any help, but you could have your tech call David Maus VW in south Orlando. The rep that deals with warranty stuff is named Michael (Mike). He should have knowledge of the issue.


Everything you are saying is the same issues I had, and it took around 6 weeks for them to finally find and fix the issue. They actually had to fly someone in from VWoA to find/fix it.
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Old August 15th, 2019, 04:43   #19
thundershorts
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kjndiver, your problem I think is different from Ixnay in the fact you haven't mentioned any burnt wires or sensors.
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Old August 15th, 2019, 19:08   #20
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kjndiver, your problem I think is different from Ixnay in the fact you haven't mentioned any burnt wires or sensors.



I didn't have any burnt wires or sensors either at first. I didn't have burnt sensors till after they changed them.
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Old August 18th, 2019, 08:31   #21
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Ok, as mentioned previously, I brought to VW on a Friday , by Tuesday I was dropping the car off to them as it was doing this every time I accelerated. I had to really feather the pedal to get going without it going into limp mode and throwing a light/code. Always the same P0087. Got a call on Thursday saying they now think it's the HPFP. Even though he had inspected and didn't see any metal just days before, now he says that he does see metal shavings . They've got a case opened with VW and I should hear back this week. He said it was strange in that this is the first time that he has seen someone still be able to drive it for as long as I did, he said it's usually one of those failures that happens and leaves you stranded as soon as it appears and doesn't go for weeks at a time. We shall see....
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Old August 18th, 2019, 10:30   #22
Smashed Ixnay
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Ok, as mentioned previously, I brought to VW on a Friday , by Tuesday I was dropping the car off to them as it was doing this every time I accelerated. I had to really feather the pedal to get going without it going into limp mode and throwing a light/code. Always the same P0087. Got a call on Thursday saying they now think it's the HPFP. Even though he had inspected and didn't see any metal just days before, now he says that he does see metal shavings . They've got a case opened with VW and I should hear back this week. He said it was strange in that this is the first time that he has seen someone still be able to drive it for as long as I did, he said it's usually one of those failures that happens and leaves you stranded as soon as it appears and doesn't go for weeks at a time. We shall see....
I hope that fixes it, but I doubt it. They said the same thing to me at first and the new HPFP didnít do anything. They even changed the fuel filter and flushed my diesel tank.

I still say itís an electrical issue coming from the dpf sensors like I had.
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Old August 19th, 2019, 05:01   #23
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If they found metal shavings in the fuel filter, it probably is from the in tank pump starting to destroy itself, not from the hpfp. Its one item that throws no codes itself, the sensors all do.
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