Audi P1556: Charge Pressure Control Negative Deviation
Is your scanner showing Audi P1556?
No worries. We'll show you what it means and how to deal with it.
Audi P1556: Charge Pressure Control Negative Deviation
OVERVIEWWhat Does The Audi P1556 Code Mean?
Engine started, battery voltage at least 11.5v, all electrical components off, ground connections between engine and chassis well connected, coolant temperature at least 80-degrees Celicius. The ECM detected deviation from the normal operating parameters of the charge pressure sensor.
What Are The Potential Causes Of The Audi P1556 Code?
- Charge air system leaks
- Recirculating valve for turbocharger is faulty
- Turbocharging system is damaged
- Vacuum diagramfor turbocharger needs adjusting
- Wastegate bypass regulator valve is faulty
- ECM has failed
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
