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U019900 — Driver-side door control unit - no communication

Driver-side door control unit - no communication. 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 U019900

Porsche Taycan

Air ConditioningEngine Control Module 1GatewayThermal Management

Porsche 911 (992)

Engine Control Module 1GatewayTME (Thermomanagement)

Porsche Panamera (971, 2017–2023)

Air ConditioningEngine Control Module 1GatewayTME (Thermomanagement)

Porsche Panamera (972, 2024–)

Air ConditioningEngine Control Module 1GatewayTME (Thermomanagement)

Porsche Cayenne (9YA)

Air ConditioningEngine Control Module 1GatewayTME (Thermomanagement)

How to read and clear U019900

  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 U019900 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 Air Conditioning

U012900Brake electronics (PSM) control unit - no communication
U014200Rear-end electronics control unit (BCM2) - missing message
U015100Airbag control unit - missing message
U015500Instrument cluster control unit - missing message
U016600Auxiliary heater control unit - no communication
U016B00Electric air-conditioning compressor (V470), no communication
U020000Door control unit, passengerʼs side - no communication
U020100Control unit for door on rear driver’s side - no communication
U020200Control unit for door on rear passenger’s side - no communication
U020700Control unit for front panoramic roof - no communication
U020A00Control unit for rear panoramic roof - no communication
U021200Steering wheel electronics control unit – missing messages

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.