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U021200 — Steering wheel electronics control unit – missing messages

Steering wheel electronics control unit – missing messages. 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 U021200

Porsche Taycan

Air ConditioningEngine Control Module 1GatewayLock Electronics

Porsche 911 (992)

Drive Motor Control ModuleEngine Control Module 1Gateway

Porsche Panamera (971, 2017–2023)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewayGQS (Quersperre)

Porsche Panamera (972, 2024–)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewayGQS (Quersperre)

Porsche Cayenne (9YA)

Air ConditioningDrive Motor Control ModuleEngine Control Module 1GatewayGQS (Quersperre)Torque Converter (Transmission)

How to read and clear U021200

  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 U021200 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

U019900Driver-side door control unit - 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
U040100Engine electronics (DME) control unit – signal implausible
U040200Transmission control unit, signal implausible
U041300High-voltage battery control unit, signal implausible
U041600Data bus - fault value received
U042200Front-end electronics control unit (BCM1) - signal implausible
U042300Instrument cluster control unit – signal implausible

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.