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B2F0400 — Development code 4

Development code 4. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne 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 B2F0400

Porsche Taycan

Aerodynamics Control UnitAirbagAir ConditioningCentral ElectricsDigital Matrix Light UnitFront Assist CameraGatewayLane Change AssistLaser ScannerSeat Module, DriverSeat Module, PassengerSteering AssistSteering Column ElectronicsTrailer Function

Porsche 911 (992)

Aerodynamics Control UnitSC (Airbag)Battery Energy Control ModuleBCM1 (Body Control Module 1)Control Unit Digital Matrix Light (ZDML)ZFAS (Zentrales Fahrer Assistenz System)GatewaySWA (Spurwechselassistent)Seat Module, DriverSeat Module, PassengerSteering AssistSteering Column Electronics

Porsche Panamera (971, 2017–2023)

Aerodynamics Control UnitSC (Airbag)Air ConditioningBattery Energy Control ModuleBCM1 (Body Control Module 1)DCDC 48V (Spannungswandler 48V)GatewaySWA (Spurwechselassistent)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideSteering AssistSteering Column ElectronicsAAG (Anhaenger)

Porsche Panamera (972, 2024–)

Aerodynamics Control UnitSC (Airbag)Air ConditioningBattery Energy Control ModuleBCM1 (Body Control Module 1)Control Unit Digital Matrix Light (ZDML)ZFAS (Zentrales Fahrer Assistenz System)GatewayMRR_HR (Radar HR)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideSteering AssistSteering Column ElectronicsAAG (Anhaenger)

Porsche Cayenne (9YA)

Aerodynamics Control UnitSC (Airbag)Air ConditioningBattery Energy Control ModuleBCM1 (Body Control Module 1)Control Unit Digital Matrix Light (ZDML)DCDC 48V (Spannungswandler 48V)ZFAS (Zentrales Fahrer Assistenz System)GatewaySWA (Spurwechselassistent)Seat Module, DriverSeat Module, PassengerSteering AssistSteering Column ElectronicsAAG (Anhaenger)

How to read and clear B2F0400

  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 B2F0400 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 Aerodynamics Control Unit

B201200Coding
B201800Authentication of a function, failed
B201C00Supply voltage, Implausible signal
B2F0100Development code 1
B2F0200Development code 2
B2F0300Development code 3
B2F0500Development code 5
B2F0600Development code 6
B2F0700Development code 7
B2F0800Development code 8
B2F0900Development code 9
B2F0A00Development code 10

All 305 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.