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U110400 — Expanded bus operation active

Expanded bus operation active. 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 U110400

Porsche Taycan

Adaptive Cruise ControlAntenna Control ModuleMatrix Headlamp LeftMatrix Headlamp RightCentral ElectricsComfort System ModuleChassis ControlSunroof Control ModuleDigital Matrix Light UnitDeck Lid Control UnitGatewayHead-Up DisplayInformation Control UnitInfotainment InterfaceLaser ScannerNight Vision AssistSeat Module, DriverSeat Module, PassengerTelematics Communication UnitTelematics Diagnostic UnitThermal Management

Porsche 911 (992)

ACC (Abstandsregelung)DDA (Digitale Dachantenne)Beamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)GatewayMIB2 (Zentralrechner)Infotainment InterfaceNightVision (Waermebildkamera)Seat Module, DriverSeat Module, PassengerTelematics Communication UnitTME (Thermomanagement)WCU – Water Tank Control Unit

Porsche Panamera (971, 2017–2023)

ACC (Abstandsregelung)BCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD2 (Schiebedach2)SAD (Schiebedach)HDSG (Heckdeckel)BVS (Bildverarbeitungssystem)GatewayHeadup DisplayMIB2 (Zentralrechner)Infotainment InterfaceNight Vision AssistSCR (Reduktionsmittel-Dosiersystem)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)

Porsche Panamera (972, 2024–)

ACC (Abstandsregelung)DDA (Digitale Dachantenne)Beamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD2 (Schiebedach)SAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)HDSG (Heckdeckel)GatewayHUD (Head Up Display)MIB3 (Zentralrechner)Infotainment InterfaceNightVision (Waermebildkamera)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)WCU – Water Tank Control Unit

Porsche Cayenne (9YA)

ACC (Abstandsregelung)DDA (Digitale Dachantenne)AEM – Active Engine MountsBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)HDSG (Heckdeckel)GatewayHUD (Head Up Display)MIB2 (Zentralrechner)Infotainment InterfaceNight Vision AssistSCR (Reduktionsmittel-Dosiersystem)Seat Module, DriverSeat Module, PassengerTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)Torque Converter (Transmission)WCU – Water Tank Control Unit

How to read and clear U110400

  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 U110400 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 Adaptive Cruise Control

U101300Coding
U101400Coding
U103100FlexRay data bus, No synchronization
U110000Component protection – not taught
U110100Component protection active
U110300Production mode active
U110500Transport mode active
U111200Data bus - implausible message
U111400Component protection – authentication failed (GFA)
U111C00Presentation mode active
U112100Data bus - missing message
U112200Data bus - implausible message

All 53 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.