p1556

[willber6]

i have a passat 1.9tdi 2004 and the trouble code is p1556. there is no power whatsoever and the turbo is whisteling. even if i turn it off and start it again its just the same. CAN ANYONE PLEASE HELP .:1zhelp:

[Hex69]

i have a passat 1.9tdi 2004 and the trouble code is p1556. there is no power whatsoever and the turbo is whisteling. even if i turn it off and start it again its just the same. CAN ANYONE PLEASE HELP .:1zhelp:

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

17964/P1556 - Charge Pressure Control: Negative Deviation

Possible Symptoms



Reduced power output
Limp mode

Possible Causes



Boost Pressure too Low
Hoses/Pipes incorrect connected, disconnected or leaking
Charger Pressure Control defective
VNT (variable nozzle turbo): nozzles stuck
Solenoid Valve for Boost Pressure Control (N75) defective

Possible Solutions



Check Hoses/Pipes to/between Components
Check Solenoid Valve for Boost Pressure Control (N75)
Check / Clean / Replace Charge Pressure Control
Check / Clean mechanism for variable nozzles

[martin1810]

Whistle suggests an intercooler pipe has come undone. Look/follow the fat air pipes that lead from the engine to the intercooler at the front and back again. I expect one has popped off.