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U012900 — Brake electronics (PSM) control unit - no communication

Brake electronics (PSM) 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 U012900

Porsche Taycan

Air ConditioningBrake BoosterEngine Control Module 1

Porsche 911 (992)

EBKV (Bremskraftverstaerker)Engine Control Module 1PDK Transmission

Porsche Panamera (971, 2017–2023)

Air ConditioningEBKV (Bremskraftverstaerker)PDK Transmission

Porsche Panamera (972, 2024–)

Air ConditioningEBKV (Bremskraftverstaerker)PDK Transmission

Porsche Cayenne (9YA)

Air ConditioningEBKV (Bremskraftverstaerker)

How to read and clear U012900

  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 U012900 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

B2F0600Development code 6
P171900Rotor position sensor – position implausible
U010000Engine electronics (DME) control unit – no communication
U010100Lost Communication with TCM
U011200High-voltage battery control unit – no communication
U011600Thermal management control unit - missing message
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
U019900Driver-side door control unit - no communication

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.