P1557
Charge Pressure Positive Deviation
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)
Symptoms
- Reduced engine power
- Engine transition to emergency mode
- Unstable operation at high speeds
- Turbine noise
- Increased fuel consumption
Causes
- Turbine actuator malfunction
- Bypass valve stuck
- Leaks in the pressure control system
- Boost pressure sensor malfunction
- Mechanical damage to the turbine
How to Fix
- Check the operation of the turbine actuator
- Diagnose the condition of the bypass valve
- Check the pressure control system for leaks
- Test the boost pressure sensor
- Inspect the turbine for mechanical damage