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U103000 — LIN bus 1 – electrical fault

LIN bus 1 – electrical fault. 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 U103000

Porsche Taycan

Air ConditioningOn-Board ChargerMatrix Headlamp LeftMatrix Headlamp RightCentral ElectricsComfort System ModuleChassis ControlSunroof Control ModuleInstrument ClusterEngine Control Module 1GatewayLight Control LeftLight Control RightRear Axle SteeringSeat Module, DriverSeat Module, PassengerTelematics Communication UnitThermal Management

Porsche 911 (992)

Beamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_vo (Bedieneinheit vorne)BCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)Kombi LGEngine Control Module 1GatewayLight Control LeftLight Control RightSeat Module, DriverSeat Module, PassengerTelematics Communication UnitTME (Thermomanagement)

Porsche Panamera (971, 2017–2023)

Air ConditioningAuxiliary HeaterOn-Board ChargerBedienSG_vo (Bedieneinheit vorne)BCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)KombiEngine Control Module 1GatewayLight Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)Rear Axle SteeringSeat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideTelematics Communication UnitTME (Thermomanagement)

Porsche Panamera (972, 2024–)

Air ConditioningAuxiliary HeaterOn-Board ChargerBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_vo (Bedieneinheit vorne)BCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)Kombi LGEngine Control Module 1GatewayLight Control LeftLight Control RightRear Axle SteeringSeat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger SideTelematics Communication Unit

Porsche Cayenne (9YA)

Air ConditioningAuxiliary HeaterOn-Board ChargerBeamer Module Matrix Headlamp LeftBeamer Module Matrix Headlamp RightBedienSG_vo (Bedieneinheit vorne)BCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSAD (Schiebedach)KombiEngine Control Module 1GatewayLight Control LeftLCM_L (Lichtsteuerung links)Light Control RightLCM_R (Lichtsteuerung rechts)Rear Axle SteeringSeat Module, DriverSeat Module, PassengerTelematics Communication UnitTME (Thermomanagement)

How to read and clear U103000

  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 U103000 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 Air Conditioning

U042500Auxiliary heater control unit – signal implausible
U045200Airbag control unit - signal implausible
U045600Thermal management control unit - signal implausible
U101100Supply voltage – too low
U101200Supply voltage – too high
U101300Coding
U104700Rear lid control unit - no communication
U107600LIN bus 2 - electrical fault
U109800Convertible top control unit - no communication
U109900Electric auxiliary heater (12V) - no communication
U10A300Windshield wiper motor – no communication
U10BA00LIN bus 1 – no communication

All 418 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.