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U300100 — Control unit – run-on fault

Control unit – run-on 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 U300100

Porsche Taycan

On-Board Charger 2On-Board ChargerBrake ElectronicsChassis ControlDC/DC ConverterDrive Motor Control ModuleEngine Control Module 1Telematics Communication UnitThermal Management

Porsche 911 (992)

Battery Energy Control ModuleBrake ElectronicsChassis ControlDC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1Telematics Communication UnitTME (Thermomanagement)

Porsche Panamera (971, 2017–2023)

On-Board Charger48 V Battery Management SystemBattery Energy Control ModuleBrake ElectronicsDrive Motor Control ModuleEngine Control Module 1

Porsche Panamera (972, 2024–)

On-Board ChargerBattery Energy Control ModuleBrake ElectronicsChassis ControlDC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1Telematics Communication UnitTME (Thermomanagement)

Porsche Cayenne (9YA)

AEM – Active Engine MountsOn-Board Charger48 V Battery Management SystemBattery Energy Control ModuleBrake ElectronicsChassis ControlDC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1Telematics Communication UnitTME (Thermomanagement)

How to read and clear U300100

  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 U300100 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 On-Board Charger 2

U112300Data bus – fault value received
U13AE00Active parking system control unit – fault detected
U140000Function restriction – supply voltage too low
U140100Function restriction – supply voltage too high
U140900Internal temperature measurement, Implausible signal
U16D300High voltage charger, pre-charging not successful

All 110 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.