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U040100 — Engine electronics (DME) control unit – signal implausible

Engine electronics (DME) control unit – signal implausible. 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 U040100

Porsche Taycan

Adaptive Cruise ControlAir ConditioningBrake ElectronicsBrake BoosterDrive Motor Control ModuleFront Assist CameraGatewayLock ElectronicsThermal ManagementTrailer Function

Porsche 911 (992)

ACC (Abstandsregelung)Battery Energy Control ModuleBrake ElectronicsEBKV (Bremskraftverstaerker)DC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1ZFAS (Zentrales Fahrer Assistenz System)GatewayMIB2 (Zentralrechner)TME (Thermomanagement)PDK Transmission

Porsche Panamera (971, 2017–2023)

ACC (Abstandsregelung)Air Conditioning48 V Battery Management SystemBattery Energy Control ModuleBrake ElectronicsEBKV (Bremskraftverstaerker)Drive Motor Control ModuleEngine Control Module 1GatewayMIB2 (Zentralrechner)GQS (Quersperre)TME (Thermomanagement)PDK Transmission

Porsche Panamera (972, 2024–)

ACC (Abstandsregelung)Air ConditioningBattery Energy Control ModuleBrake ElectronicsEBKV (Bremskraftverstaerker)DC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1ZFAS (Zentrales Fahrer Assistenz System)GatewayGQS (Quersperre)TME (Thermomanagement)AAG (Anhaenger)PDK Transmission

Porsche Cayenne (9YA)

ACC (Abstandsregelung)Air Conditioning48 V Battery Management SystemBattery Energy Control ModuleBrake ElectronicsEBKV (Bremskraftverstaerker)DC/DC Converter Control Module HVDrive Motor Control ModuleEngine Control Module 1ZFAS (Zentrales Fahrer Assistenz System)GatewayMIB2 (Zentralrechner)GQS (Quersperre)TME (Thermomanagement)AAG (Anhaenger)Torque Converter (Transmission)

How to read and clear U040100

  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 U040100 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

C11EEF3Time delay function, Unexpected values from driver assistance systems control module
C11EEF7Time delay function, implausible condition
C12D1F2Airbag control module, Signal not qualified
C12D5F8Driver assistance systems control module, Signal not initialized
C12E0F1Congestion pilot, Function restriction
C12EBF3Laser for adaptive cruise control, Restricted range detection
U101100Supply voltage – too low
U101200Supply voltage – too high
U101300Coding
U101400Coding
U103100FlexRay data bus, No synchronization
U110000Component protection – not taught

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.