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U012200 — Brake electronics (PSM) control unit – missing message

Brake electronics (PSM) control unit – missing message. 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 U012200

Porsche Taycan

Lock Electronics

Porsche 911 (992)

Battery Energy Control ModulePDK Transmission

Porsche Panamera (971, 2017–2023)

48 V Battery Management SystemBattery Energy Control ModuleGQS (Quersperre)PDK Transmission

Porsche Panamera (972, 2024–)

Battery Energy Control ModuleGQS (Quersperre)PDK Transmission

Porsche Cayenne (9YA)

48 V Battery Management SystemBattery Energy Control ModuleGQS (Quersperre)Torque Converter (Transmission)

How to read and clear U012200

  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 U012200 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 Lock Electronics

C13AFF6Transverse lock, position sensor, power supply, open circuit
C13AFF7Transverse lock, position sensor, signal line, short circuit to signal line
C13AFF8Transverse lock, position sensor, power supply - short circuit to ground
U010000Engine electronics (DME) control unit – no communication
U010100Lost Communication with TCM
U011400All-wheel drive electronics control unit (PTM) - no communication
U014600Gateway control unit - no communication
U015100Airbag control unit - missing message
U015500Instrument cluster control unit - missing message
U021200Steering wheel electronics control unit – missing messages
U040100Engine electronics (DME) control unit – signal implausible
U040200Transmission control unit, signal implausible

All 67 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.