fault help!!

[turbo017]

i got this code on 1.8t any ideas would be good as to what is causing it 17964 or p1556-35-10 charge pressure control-negative deviation

 

[acidstrato]

either you N75 is kaput or the hoses are split or fitted incorrectly

 

[Theresias]

http://wiki.ross-tech.com/index.php/17964/P1556/005462