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U103100 — FlexRay data bus, No synchronization

FlexRay data bus, No synchronization. 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 U103100

Porsche Taycan

Adaptive Cruise ControlAirbagChassis ControlLane Change Assist 2Drive Motor Control ModuleFront Corner Radar 1Front Corner Radar 2Front Assist CameraGatewayLane Change AssistLaser ScannerLock ElectronicsRear Axle SteeringSteering AssistSteering Column Electronics

Porsche 911 (992)

ACC (Abstandsregelung)SC (Airbag)Chassis ControlSWA2 (Spurwechselassistent 2)ZFAS (Zentrales Fahrer Assistenz System)GatewayMIB2 (Zentralrechner)SWA (Spurwechselassistent)Rear Axle SteeringSteering AssistSteering Column Electronics

Porsche Panamera (971, 2017–2023)

ACC2 (Abstandsregelung 2)ACC (Abstandsregelung)SC (Airbag)Chassis ControlSWA2 (Spurwechselassistent 2)BVS (Bildverarbeitungssystem)GatewayMIB2 (Zentralrechner)SWA (Spurwechselassistent)GQS (Quersperre)Rear Axle SteeringSteering AssistSteering Column Electronics

Porsche Panamera (972, 2024–)

ACC (Abstandsregelung)SC (Airbag)Chassis ControlMRR_HL (Radar HL)MRR_VR (Radar VR)MRR_VL (Radar VL)ZFAS (Zentrales Fahrer Assistenz System)GatewayMRR_HR (Radar HR)GQS (Quersperre)Rear Axle SteeringSteering AssistSteering Column Electronics

Porsche Cayenne (9YA)

ACC (Abstandsregelung)SC (Airbag)Chassis ControlSWA2 (Spurwechselassistent 2)MRR_VR (Radar VR)MRR_VL (Radar VL)ZFAS (Zentrales Fahrer Assistenz System)GatewayMIB2 (Zentralrechner)SWA (Spurwechselassistent)GQS (Quersperre)Rear Axle SteeringSteering AssistSteering Column Electronics

How to read and clear U103100

  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 U103100 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 Adaptive Cruise Control

C12EBF3Laser for adaptive cruise control, Restricted range detection
U040100Engine electronics (DME) control unit – signal implausible
U101100Supply voltage – too low
U101200Supply voltage – too high
U101300Coding
U101400Coding
U110000Component protection – not taught
U110100Component protection active
U110300Production mode active
U110400Expanded bus operation active
U110500Transport mode active
U111200Data bus - implausible message

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.