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U042200 — Front-end electronics control unit (BCM1) - signal implausible

Front-end electronics control unit (BCM1) - 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 U042200

Porsche Taycan

Air ConditioningEngine Control Module 1GatewayLane Change AssistThermal ManagementTrailer Function

Porsche 911 (992)

Drive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)TME (Thermomanagement)

Porsche Panamera (971, 2017–2023)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)TME (Thermomanagement)AAG (Anhaenger)

Porsche Panamera (972, 2024–)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewayMRR_HR (Radar HR)TME (Thermomanagement)AAG (Anhaenger)

Porsche Cayenne (9YA)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewaySWA (Spurwechselassistent)TME (Thermomanagement)AAG (Anhaenger)Torque Converter (Transmission)

How to read and clear U042200

  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 U042200 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

U020A00Control unit for rear panoramic roof - no communication
U021200Steering wheel electronics control unit – missing messages
U040100Engine electronics (DME) control unit – signal implausible
U040200Transmission control unit, signal implausible
U041300High-voltage battery control unit, signal implausible
U041600Data bus - fault value received
U042300Instrument cluster control unit – signal implausible
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

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.