Function Restricted due to Insufficient Voltage
VAG · network
Data confidence80%
The control module detected a response consistent with a blocked or restricted Function. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 31896. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Manufacturer-defined range: the meaning can differ between brands.
400
Specific fault index within the subsystem.
Frequently asked questions about U1400
What does U1400 mean?
Function Restricted due to Insufficient Voltage. The control module detected a response consistent with a blocked or restricted Function. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 31896. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).
Is U1400 generic or manufacturer-specific?
U1400 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 U1400 at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U1400 is removable in your case.
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