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U120000 — Data bus, Faulty

Data bus, Faulty. 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 U120000

Porsche Taycan

Exterior Sound ActuatorSound ActuatorAntenna Control ModuleMatrix Headlamp LeftMatrix Headlamp RightRear View CameraComfort System ModuleMobile Device ChargerChassis ControlSunroof Control ModuleDigital Matrix Light UnitLane Change Assist 2Deck Lid Control UnitDoor Module, DriverDoor Module, PassengerDriver Monitoring SystemGear Shift Control ModuleHead-Up DisplayInformation Control UnitLane Change AssistLight Control LeftLight Control RightTelematics Communication UnitTelematics Diagnostic UnitTyre Pressure Monitor

Porsche 911 (992)

SoundaktuatorDDA (Digitale Dachantenne)Beamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightRueckfahrkameraBCM2 (Body Control Module 2)Ladegeraet 1 fuer mobile EndgeraeteChassis ControlSAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)SWA2 (Spurwechselassistent 2)Tuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)Driver Monitoring System 2Engine Control Module 1WH (Waehlhebel)MIB2 (Zentralrechner)SWA (Spurwechselassistent)Light Control LeftLight Control RightELV – Electric Steering LockTelematics Communication UnitRDK (Reifendruckkontrolle)WCU – Water Tank Control Unit

Porsche Panamera (971, 2017–2023)

Exterior Sound ActuatorSoundaktuatorAuxiliary HeaterOn-Board ChargerRueckfahrkameraBCM2 (Body Control Module 2)Mobile Device ChargerChassis ControlSDC2 (Anzeige Bedieneinheit HL)SDC1 (Anzeige Bedieneinheit HR)SAD2 (Schiebedach2)SAD (Schiebedach)SWA2 (Spurwechselassistent 2)HDSG (Heckdeckel)Door Module, DriverDoor Module, PassengerWH (Waehlhebel)Headup DisplayMIB2 (Zentralrechner)SWA (Spurwechselassistent)Light Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)SCR (Reduktionsmittel-Dosiersystem)ELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitRDK (Reifendruckkontrolle)

Porsche Panamera (972, 2024–)

Exterior Sound ActuatorSoundaktuatorDDA (Digitale Dachantenne)Auxiliary HeaterBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightRueckfahrkameraBCM2 (Body Control Module 2)Mobile Device ChargerMobile Device Charger 2Chassis ControlSAD2 (Schiebedach)SAD (Schiebedach)Control Unit Digital Matrix Light (ZDML)MRR_HL (Radar HL)HDSG (Heckdeckel)Tuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)Driver Monitoring System 2WH (Waehlhebel)HUD (Head Up Display)MIB3 (Zentralrechner)MRR_HR (Radar HR)Light Control LeftLight Control RightELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitRDK (Reifendruckkontrolle)WCU – Water Tank Control Unit

Porsche Cayenne (9YA)

Exterior Sound ActuatorSoundaktuatorDDA (Digitale Dachantenne)AEM – Active Engine MountsAuxiliary HeaterOn-Board ChargerBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightRueckfahrkameraBCM2 (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)HDSG (Heckdeckel)Door Module, DriverDoor Module, PassengerDriver Monitoring System 2WH (Waehlhebel)HUD (Head Up Display)MIB2 (Zentralrechner)SWA (Spurwechselassistent)Light Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)SCR (Reduktionsmittel-Dosiersystem)ELV – Electric Steering LockTelematics Communication UnitTelematics Diagnostic UnitRDK (Reifendruckkontrolle)WCU – Water Tank Control Unit

How to read and clear U120000

  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 U120000 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 →

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Other codes of the Exterior Sound Actuator

U101200Supply voltage – too high
U10D900Control unit not installed correctly
U110300Production mode active
U112100Data bus - missing message
U112200Data bus - implausible message
U112300Data bus – fault value received
U120100Data bus, No communication
U140000Function restriction – supply voltage too low
U140100Function restriction – supply voltage too high
U18C800Data bus, Faulty
U1A5F00Acoustic Simulator (J943), unexpected restart

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.