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U043100 — Data bus - fault value received

Data bus - fault value received. 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 U043100

Porsche Taycan

Matrix Headlamp LeftMatrix Headlamp RightBrake ElectronicsDrive Motor Control ModuleEngine Control Module 1GatewayLane Change AssistTrailer Function

Porsche 911 (992)

Battery Energy Control ModuleBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBrake ElectronicsDrive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)

Porsche Panamera (971, 2017–2023)

Battery Energy Control ModuleBrake ElectronicsEBKV (Bremskraftverstaerker)Drive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)AAG (Anhaenger)

Porsche Panamera (972, 2024–)

Battery Energy Control ModuleBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBrake ElectronicsDrive Motor Control ModuleEngine Control Module 1GatewayMRR_HR (Radar HR)AAG (Anhaenger)

Porsche Cayenne (9YA)

Battery Energy Control ModuleBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBrake ElectronicsEBKV (Bremskraftverstaerker)Drive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)AAG (Anhaenger)Torque Converter (Transmission)

How to read and clear U043100

  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 U043100 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 Matrix Headlamp Left

B2F0200Development code 2
C10CA00Limp home active
C119F00Headlight - country variant implausible
C11A098Control module, Temperature too high
C11A0F0Temperature sensor (internal) - electrical fault
U041500Control unit for brake electronics (PSM) – signal implausible
U101100Supply voltage – too low
U101200Supply voltage – too high
U103000LIN bus 1 – electrical fault
U110400Expanded bus operation active
U112100Data bus - missing message
U120000Data bus, Faulty

All 26 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.