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U112100 — Data bus - missing message
Data bus - missing message. 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 U112100
Porsche Taycan
Exterior Sound ActuatorSound ActuatorAdaptive Cruise ControlAerodynamics Control UnitAirbagAir ConditioningAntenna Control ModuleOn-Board Charger 2On-Board ChargerBattery Energy Control ModuleMatrix Headlamp LeftMatrix Headlamp RightRear Operating UnitBrake ElectronicsBrake BoosterRear View CameraCentral ElectricsComfort System ModuleMobile Device ChargerChassis ControlSunroof Control ModuleDigital Matrix Light UnitLane Change Assist 2Instrument ClusterDC/DC Converter 2DC/DC ConverterDeck Lid Control UnitDoor Module, DriverDoor Module, PassengerDriver Monitoring SystemEngine Control Module 1Front Corner Radar 1Front Corner Radar 2Front Assist CameraGatewayGear Shift Control ModuleHead-Up DisplayInformation Control UnitInfotainment InterfaceLane Change AssistLaser ScannerLight Control LeftLight Control RightLock ElectronicsNight Vision AssistOTA Function Control UnitRear Axle SteeringRoll Control SystemSeat Module, DriverSeat Module, PassengerSound SystemSteering AssistSteering Column ElectronicsTelematics Communication UnitTelematics Diagnostic UnitThermal ManagementTyre Pressure MonitorTrailer Function
Porsche 911 (992)
SoundaktuatorACC (Abstandsregelung)Aerodynamics Control UnitSC (Airbag)All-Wheel Drive ControlDDA (Digitale Dachantenne)Beamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_vo (Bedieneinheit vorne)Brake ElectronicsEBKV (Bremskraftverstaerker)RueckfahrkameraBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Ladegeraet 1 fuer mobile EndgeraeteChassis ControlSAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)SWA2 (Spurwechselassistent 2)Kombi LGTuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)Driver Monitoring System 2PADM (Dynamische Aggregatelagerung)Convertible Top Control UnitEngine Control Module 1Lift VA (Lift Vorderachse)ZFAS (Zentrales Fahrer Assistenz System)GatewayWH (Waehlhebel)MIB2 (Zentralrechner)Infotainment InterfaceSWA (Spurwechselassistent)Light Control LeftLight Control RightNightVision (Waermebildkamera)Rear Axle SteeringRoll Control System 2Seat Module, DriverSeat Module, PassengerDSP (Audioverstaerker)Steering AssistSteering Column ElectronicsELV – Electric Steering LockTelematics Communication UnitTME (Thermomanagement)RDK (Reifendruckkontrolle)VTS (Diebstahlverfolgungssystem)WCU – Water Tank Control Unit
Porsche Panamera (971, 2017–2023)
Exterior Sound ActuatorSoundaktuatorACC2 (Abstandsregelung 2)PACCh (Berechnung optimale Fahrstrategie)ACC (Abstandsregelung)Aerodynamics Control UnitSC (Airbag)Air ConditioningAuxiliary HeaterOn-Board ChargerBedienSG_hi (Bedieneinheit hinten)BedienSG_vo (Bedieneinheit vorne)Brake ElectronicsEBKV (Bremskraftverstaerker)RueckfahrkameraBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Mobile Device ChargerChassis ControlSDC2 (Anzeige Bedieneinheit HL)SDC1 (Anzeige Bedieneinheit HR)SAD2 (Schiebedach2)SAD (Schiebedach)SWA2 (Spurwechselassistent 2)KombiDCDC 48V (Spannungswandler 48V)HDSG (Heckdeckel)Door Module, DriverDoor Module, PassengerEngine Control Module 1BVS (Bildverarbeitungssystem)GatewayWH (Waehlhebel)Headup DisplayMIB2 (Zentralrechner)Infotainment InterfaceSWA (Spurwechselassistent)Light Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)GQS (Quersperre)DVD WechslerNight Vision AssistRear Axle SteeringSCR (Reduktionsmittel-Dosiersystem)eAWS1 (elektrische Aktive Wank Stabilisierung 1)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideDSP (Audioverstaerker)Steering AssistSteering Column ElectronicsELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)RDK (Reifendruckkontrolle)AAG (Anhaenger)VTS (Diebstahlverfolgungssystem)
Porsche Panamera (972, 2024–)
Exterior Sound ActuatorSoundaktuatorACC (Abstandsregelung)Aerodynamics Control UnitSC (Airbag)Air ConditioningDDA (Digitale Dachantenne)Auxiliary HeaterOn-Board ChargerBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_hi (Bedieneinheit hinten)BedienSG_vo (Bedieneinheit vorne)Brake ElectronicsEBKV (Bremskraftverstaerker)RueckfahrkameraBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Mobile Device ChargerMobile Device Charger 2Chassis ControlSAD2 (Schiebedach)SAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)MRR_HL (Radar HL)Kombi LGHDSG (Heckdeckel)Tuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)Driver Monitoring System 2Engine Control Module 1MRR_VR (Radar VR)MRR_VL (Radar VL)ZFAS (Zentrales Fahrer Assistenz System)GatewayWH (Waehlhebel)HUD (Head Up Display)Image Processing ElectronicsMIB3 (Zentralrechner)Infotainment InterfaceMRR_HR (Radar HR)Light Control LeftLight Control RightGQS (Quersperre)NightVision (Waermebildkamera)Rear Axle SteeringeAWS1 (elektrische Aktive Wank Stabilisierung 1)Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideDSP (Audioverstaerker)Steering AssistSteering Column ElectronicsELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)RDK (Reifendruckkontrolle)AAG (Anhaenger)WCU – Water Tank Control Unit
Porsche Cayenne (9YA)
Exterior Sound ActuatorSoundaktuatorPACCh (Berechnung optimale Fahrstrategie)ACC (Abstandsregelung)Aerodynamics Control UnitSC (Airbag)Air ConditioningAll-Wheel Drive ControlDDA (Digitale Dachantenne)AEM – Active Engine MountsAuxiliary HeaterOn-Board ChargerBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_hi (Bedieneinheit hinten)BedienSG_vo (Bedieneinheit vorne)Brake ElectronicsEBKV (Bremskraftverstaerker)RueckfahrkameraBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Mobile Device ChargerChassis ControlSDC2 (Anzeige Bedieneinheit HL)SDC1 (Anzeige Bedieneinheit HR)SAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)SWA2 (Spurwechselassistent 2)KombiDCDC 48V (Spannungswandler 48V)HDSG (Heckdeckel)Door Module, DriverDoor Module, PassengerDriver Monitoring System 2Engine Control Module 1MRR_VR (Radar VR)MRR_VL (Radar VL)ZFAS (Zentrales Fahrer Assistenz System)GatewayWH (Waehlhebel)HUD (Head Up Display)MIB2 (Zentralrechner)Infotainment InterfaceSWA (Spurwechselassistent)Light Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)GQS (Quersperre)DVD WechslerNight Vision AssistRear Axle SteeringSCR (Reduktionsmittel-Dosiersystem)eAWS1 (elektrische Aktive Wank Stabilisierung 1)Seat Module, DriverSeat Module, PassengerDSP (Audioverstaerker)Steering AssistSteering Column ElectronicsELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitTME (Thermomanagement)RDK (Reifendruckkontrolle)AAG (Anhaenger)VTS (Diebstahlverfolgungssystem)WCU – Water Tank Control Unit
How to read and clear U112100
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and U112100 shows with its status, its full description and the freeze frame when the unit stores one.
- 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 readingOther codes of the Exterior Sound Actuator
| P1C8D00 | Production restrictions active |
| P1EEC00 | Loudspeaker test active |
| U101100 | Supply voltage – too low |
| U101200 | Supply voltage – too high |
| U10D900 | Control unit not installed correctly |
| U110300 | Production mode active |
| U112200 | Data bus - implausible message |
| U112300 | Data bus – fault value received |
| U120000 | Data bus, Faulty |
| U120100 | Data bus, No communication |
| U140000 | Function restriction – supply voltage too low |
| U140100 | Function restriction – supply voltage too high |
All 50 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.