The P2563 Implausible signal in the turbo boost control position sensor circuit occurs when the car is idling or low revs, typically when waiting to turn right, or otherwise in a queue of traffic.  The engine is usually warm.  The engine management light flashes and a warning appears on the dot matrix display, but only for a handful of seconds and then stops, as if nothing had happened.  The car appears to drive normally.  This has happened between  5 and 10 times in the last 2 months.

 

The P0299 error has occurred twice, on both occasions within 2 minutes of starting the car on a cold (for the UK) morning (<5C) whilst driving up a steep hill at (I think) 2,500 to 3,000 rpm, again flashing engine management light.  The car went into limp mode and on both occasions I was able to pull over turn the car off and restart.  The car restarted without the error and I could continue up the hill driving as normal, without apparent issue.

 

I've done my background research on here and have noted all the comments about vacuum lines and the car is booked into a local mechanic after Christmas to investigate.  I shared the pointer about leaking vacuum pipes and he commented that he thought that this engine has an electric boost controller, not vacuum.  The engine is the 170PS 2.0 turbo diesel and the year is 2010.  Is he right, or does this engine have the same vacuum lines as others?  He will realise once he opens the bonnet, but I wanted to check whether their might be different issues at play if the controller is electric.

 

Are the two different codes likely to be symptoms caused by the same fault?  Does the existence of both codes point to a particular fault, or at least narrow down the range of possible causes?  Do the circumstances of when the faults occur help with diagnosis?

 

I would welcome any hints or tips that I can pass onto my mechanic, he is genuinely receptive to guidance from user forums.

 

Thanks,

Ian

Had same fault code 1 week ago. P2563, with MIL engine and blinking glpw plug symbol. Got home to check for vacum leaks through vane turbo rod, to n75 valve and of course all turbo intake hoses, clamps etc. Found out that a non return vacum brake booster hose had a disconnected hose. A part had been broken off and to my surprise, this had happened before. Because the small hose intake had been glued before. See my picture. So I just superglied it back on and tried to se if that emergency fix worked. And it did, at least until I can order a new non return valve brake booster hose from dealership. Partnr for my 6spd dsg,  4x4, 2.0tdi engine is 3T0 612 041D. The pipe is connected directly to vacumpump in engine and to brake booster housing. The small vacum hose notch almost directly connected into vacumpump that was broken went to another vacum hose. I bet you will locate it in your engine bay.

Edited 3 January, 20242 yr by rbhelle
Update in text ending

Yes, both fault codes can be caused by the same error. Likely vacum hoses, n75 or in worst case, failure of turbo van valve (more time consuming repair)

Thanks for the suggestions.  Garage mechanic said that the system holds a vacuum, which in his view suggests that the valve needs replacing.  Since the issue is intermittent at the moment and is easily reset, I haven't gone ahead with the replacement.