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U111400 — Component protection – authentication failed (GFA)

Component protection – authentication failed (GFA). 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 U111400

Porsche Taycan

Adaptive Cruise ControlOn-Board Charger 2On-Board ChargerBattery Energy Control ModuleBrake ElectronicsCentral ElectricsComfort System ModuleChassis ControlInstrument ClusterDC/DC ConverterDrive Motor Control ModuleEngine Control Module 1GatewayInformation Control UnitOTA Function Control UnitTelematics Communication Unit

Porsche 911 (992)

ACC (Abstandsregelung)Brake ElectronicsBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlKombi LGEngine Control Module 1GatewayMIB2 (Zentralrechner)Rear Axle SteeringTelematics Communication UnitPDK Transmission

Porsche Panamera (971, 2017–2023)

ACC2 (Abstandsregelung 2)ACC (Abstandsregelung)On-Board ChargerBattery Energy Control ModuleBrake ElectronicsBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSDC2 (Anzeige Bedieneinheit HL)SDC1 (Anzeige Bedieneinheit HR)KombiGatewayMIB2 (Zentralrechner)Telematics Communication Unit

Porsche Panamera (972, 2024–)

ACC (Abstandsregelung)On-Board ChargerBrake ElectronicsBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlKombi LGEngine Control Module 1GatewayMIB3 (Zentralrechner)Telematics Communication Unit

Porsche Cayenne (9YA)

ACC (Abstandsregelung)On-Board ChargerBattery Energy Control ModuleBrake ElectronicsBCM1 (Body Control Module 1)BCM2 (Body Control Module 2)Chassis ControlSDC2 (Anzeige Bedieneinheit HL)SDC1 (Anzeige Bedieneinheit HR)KombiEngine Control Module 1GatewayMIB2 (Zentralrechner)Telematics Communication Unit

How to read and clear U111400

  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 U111400 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 Adaptive Cruise Control

U110000Component protection – not taught
U110100Component protection active
U110300Production mode active
U110400Expanded bus operation active
U110500Transport mode active
U111200Data bus - implausible message
U111C00Presentation mode active
U112100Data bus - missing message
U112200Data bus - implausible message
U112300Data bus – fault value received
U13EE00Airbag control module timestamp, implausible
U140000Function restriction – supply voltage too low

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.