Fault code query?

[Black TDI Turbo]

Hi guys anyone any idea of what causes this fault codes

17964 P1556 Charge Pressure Contr. Negative Deviation

got it a few times causing limp mode, no big deal just curious?


On a posative note just had the car out there for a blast and log, got 176.8g/s at 5900rpm with external temp of 9degrees and intake temps of 18degress with 20max with custom front mount pretty good.

 

[starletcraig]

Hi guys anyone any idea of what causes this fault codes

17964 P1556 Charge Pressure Contr. Negative Deviation

got it a few times causing limp mode, no big deal just curious?


On a posative note just had the car out there for a blast and log, got 176.8g/s at 5900rpm with external temp of 9degrees and intake temps of 18degress with 20max with custom front mount pretty good.

boost leak i believe, this used to pop up on mine and it was a popped SMIC pipe

 

[Sharky_82]

boost leak - i had this (well had positive deviation) - one of the pipes near the n112 valve had the smallest of cracks

 

[Black TDI Turbo]

Ah rite no bother cheers lads, ive already changed all of my vacuum pipes with red silicone ones but i will check them for connections or splits tomorrow, Cheers.