17963 P1555 Charge Pressure Upper Limit exceeded FAULT

cupra786

Active Member
Feb 13, 2011
34
0
Hi had my seat leon mk1 1.8t on diagnostic yesterday since it went into limp mode, had about 11 fault codes, cleared all and today on start up eml light came back on. Plugged back on diagnostic and it gave this code:

'17963 P1555 Charge Pressure Upper Limit exceeded'

Id say its to with a faulty n75 valve? but if anyone could explain what exactly this code and the solution to it is it would be appreciated.

Thanks

Cupra786
 

cupra786

Active Member
Feb 13, 2011
34
0
Iv already changed the n75 valve once due to the old one being knackered. Bought a new one and for the first week or so ot was fine. would you say its a faulty n75 as i can still claim warranty on it
 

RyanWaters

Active Member
Nov 10, 2017
7
0
Ive just had the same code pop up! Cars gone into limp mode. I need help

Sent from my SM-G930F using Tapatalk
 

verbal_kint

Active Member
Apr 15, 2010
639
31
North West Kent
Courtesy of Ross Tech

17963/P1555 - Boost Pressure Control: Upper Limit Exceeded

Possible Symptoms
Reduced power output
Limp mode

Possible Causes
Boost Pressure too High
Hoses/Pipes incorrect connected, disconnected, blocked 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


If you're doing the work yourself you might be lucky and find a vacuum pipe split somewhere.
 
Last edited:
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