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B1B7421 — High-voltage voltage converter, voltage sensor, below minimum

High-voltage voltage converter, voltage sensor, below minimum. 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 B1B7421

Porsche Taycan

DC/DC Converter

How to read and clear B1B7421

  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 B1B7421 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

B193D11Control unit – Function limitation
B193D12Control unit – Function limitation
B193D21Control unit – function restriction
B193D22Control unit – Function limitation
B1A7E00Emergency shut-down
B1A8501High-voltage output voltage sensor, Electrical malfunction
B200000Control unit – function restriction
B200100Control unit – wrong software version
B200500Coding
B201200Coding
B201800Authentication of a function, failed
B201C21Supply voltage, above maximum

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.