TuningBot DTC Database · v4.37.15
Manufacturer-specific interpretation for VAG. All interpretations of P1556
The control module determined that the Turbocharger (TC) pressure - control adaptation reached its permissible limit. This is the manufacturer-specific definition used by Audi.
The control module detected that the actual Charge Pressure Control value stayed below the specified value (negative control deviation). This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 17964. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Powertrain: engine, transmission and driveline systems.
Manufacturer-defined range: the meaning can differ between brands.
Specific fault index within the subsystem.
Diagnostic Trouble Code (2 interpretations). The control module determined that the Turbocharger (TC) pressure - control adaptation reached its permissible limit. This is the manufacturer-specific definition used by Audi.
P1556 is a manufacturer-specific code. In this database it is documented for: VAG. The same number can mean something different on other brands.
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.
Understand the system behind this code: Diagnostic Strategy and DTC Logic
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