17964/P1556/005462
From Ross-Tech Wiki
17964/P1556 - Charge Pressure Control: Negative Deviation
Possible Symptoms
- Boost pressure too low
- Reduced power output
- Limp mode
Possible Causes
- Hoses/Pipes incorrect connected, disconnected or leaking
- Charger Pressure Control defective
- Solenoid Valve for Boost Pressure Control (N75) defective
Possible Solutions
- Check Hoses/Pipes to/between Components
- Check Charge Pressure Control
- Check Solenoid Valve for Boost Pressure Control (N75)