Charge Pressure Control: Negative Deviation

[iainst26]

Hi Guys, looking for a bit of information on the above, its actually my dads car, its an Octavia 1.9TDi ASV engine.

When towing his caravan he has noticed lately that when faced with any incline the car 'bogs down' Iv run VCDS on it cleared all faults and given the car a good drive until the symptoms returned, re-scanned and the fault was as follows:

1 Fault Found:
17964 - Charge Pressure Control: Negative Deviation
P1556 - 35-10 - - - Intermittent
Readiness: N/A

Any help on what is causing this would be greatly appreciated

Thanks in advance

Iain

[matta4]

Take a look here its likely a faulty N75 but there are other causes this will help you out http://wiki.ross-tech.com/wiki/index.php/17964/P1556/005462

[martin1810]

Probably a damaged vacuum pipe. Have a look here for further help http://sites.google.com/site/1810martin/vw-passat-b5-tdi-turbo-control

[VAGMAN54]

could also be a turbo with a snapped shaft i had that one today ,rare for it to be the turbo but worth taking the boost pipe of to check

[VAGMAN54]

you would think people would at least say thanks to forum members for helping with only 4 posts you never know when you might need helping again