17963/P1555/005461
From Ross-Tech Wiki
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