The control module detected that the monitored Turbocharger (TC) pressure - upper limit value exceeded the calibrated threshold. This is the manufacturer-specific definition used by Audi.
The control module detected that the monitored Boost Pressure Control: Upper Limit value exceeded the calibrated threshold. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 17963. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Symptoms
Reduced power output
Limp mode
Possible causes
Boost Pressure too High
Hoses/Pipes incorrect connected, disconnected, blocked or leaking
Charger Pressure Control defective
Solenoid Valve for Boost Pressure Control (N75) defective
Recommended checks
Check Hoses/Pipes to/between Components
Check Solenoid Valve for Boost Pressure Control (N75)
Powertrain: engine, transmission and driveline systems.
1
Manufacturer-defined range: the meaning can differ between brands.
555
Specific fault index within the subsystem.
Frequently asked questions about P1555
What does P1555 mean?
Diagnostic Trouble Code (2 interpretations). The control module detected that the monitored Turbocharger (TC) pressure - upper limit value exceeded the calibrated threshold. This is the manufacturer-specific definition used by Audi.
Is P1555 generic or manufacturer-specific?
P1555 is a manufacturer-specific code. In this database it is documented for: VAG. The same number can mean something different on other brands.
Can TuningBot remove P1555 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.