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U174A00 — Control unit – function restriction

Control unit – function restriction. The Taycan report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set U174A00

Porsche Taycan

DC/DC Converter

How to read and clear U174A00

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and U174A00 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

Download STEUER14 — free fault reading

Other codes of the DC/DC Converter

U140000Function restriction – supply voltage too low
U140100Function restriction – supply voltage too high
U140800Internal voltage measurement, Implausible signal
U14D200Function restriction, crash signal
U174800Control unit – function restriction
U174900Control unit – function restriction
U174B00Control unit – function restriction
U1A3300Control unit – Function limitation
U1A5600HV voltage converter - malfunction
U1A6000Control unit – function restriction
U1A6100Control unit – Function limitation
U1A6200Control unit – function restriction

All 200 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.