Audi DTC P1555 – Charge Pressure Upper Limit exceeded
DTC P1555 meaning on Audi
The Diagnostic Trouble Code (DTC) P1555 on an Audi indicates that the charge pressure in the turbocharger system has exceeded the upper limit set by the Engine Control Module (ECM). This typically occurs when the turbocharger is producing more boost pressure than the ECM expects, leading to a potential overboost condition.
Audi DTC P1555 symptoms
Symptoms of DTC P1555 on an Audi may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine power or performance
- Increased fuel consumption
- Audible turbocharger noise or whistling
Audi DTC P1555 causes
Common causes of DTC P1555 on an Audi include:
- Wastegate malfunction
- Boost pressure sensor failure
- Leaking or damaged intercooler hoses
- Dirty or clogged air filter
- Faulty turbocharger
Audi DTC P1555 seriousness
Ignoring DTC P1555 on an Audi can lead to potential engine damage due to overboost conditions. It is important to address this issue promptly to prevent further complications and ensure the proper functioning of the turbocharger system.
How to diagnose DTC P1555 on Audi
To diagnose DTC P1555 on an Audi, you can perform the following steps:
- Use an OBD-II scanner to retrieve the fault code and freeze frame data
- Inspect the turbocharger system for any visible leaks or damage
- Check the wastegate operation and boost pressure sensor readings
- Clean or replace the air filter if necessary
- Perform a boost pressure test to verify the actual pressure readings
How to fix DTC P1555 on Audi
To fix DTC P1555 on an Audi, you can try the following solutions:
- Inspect and repair any leaks in the intercooler hoses
- Replace the boost pressure sensor if faulty
- Clean or replace the air filter to ensure proper airflow
- Check and adjust the wastegate operation as needed
- If the issue persists, consider replacing the turbocharger
How to erase DTC P1555 on Audi
To erase DTC P1555 on an Audi, you can use an OBD-II scanner to clear the fault code from the ECM’s memory. After addressing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and allow you to monitor the system for any recurring problems.
Recommended tools for Audi diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.