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B122B12 — Central locking motors, Short circuit to B+

Central locking motors, Short circuit to B+. 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 B122B12

Porsche Taycan

Door Module, DriverDoor Module, PassengerDoor Module, Rear DriverDoor Module, Rear Passenger

Porsche 911 (992)

Tuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)

Porsche Panamera (971, 2017–2023)

Door Module, DriverDoor Module, PassengerDoor Module, Rear DriverDoor Module, Rear Passenger

Porsche Panamera (972, 2024–)

Tuer_FS (Tuere vorne Fahrerseite)Tuer_BFS (Tuere vorne Beifahrerseite)Tuer_FSh (Tuere hinten Fahrerseite)Tuer_BFSh (Tuere hinten Beifahrerseite)

Porsche Cayenne (9YA)

Door Module, DriverDoor Module, PassengerDoor Module, Rear DriverDoor Module, Rear Passenger

How to read and clear B122B12

  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 B122B12 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 Door Module, Driver

B11FB11Light for interior door handle illumination, Short circuit to ground
B11FB13Light for interior door handle illumination, Open circuit
B11FD01Turn signal in exterior rear-view mirror, Electrical error
B11FD13Turn signal in exterior rear-view mirror, Open circuit
B121029Rear lid remote release button, Implausible signal
B122B11Central locking motors, Short circuit to ground
B122B13Central locking motors, Open circuit
B122D29Lock unit for central locking, Implausible signal
B122F29Contact switch for lock cylinder, Implausible signal
B123029Button for interior lock, Implausible signal
B125F01Closing assist motor, Electrical error
B125F4BClosing Assist Motor, Excess temperature

All 107 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.