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B12FD54 — Immobilizer – not taught

Immobilizer – not taught. 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 B12FD54

Porsche Taycan

Comfort System ModuleDrive Motor Control ModuleTelematics Communication Unit

Porsche 911 (992)

BCM2 (Body Control Module 2)Telematics Communication Unit

Porsche Panamera (971, 2017–2023)

BCM2 (Body Control Module 2)GatewayTelematics Communication Unit

Porsche Panamera (972, 2024–)

BCM2 (Body Control Module 2)Telematics Communication Unit

Porsche Cayenne (9YA)

BCM2 (Body Control Module 2)GatewayTelematics Communication Unit

How to read and clear B12FD54

  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 B12FD54 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 Comfort System Module

B12CF12Right direction indicator light in tailgate – short circuit to B+
B12CF13Right direction indicator light in tailgate – open circuit
B12CF15Right direction indicator light in tailgate – short circuit to B+ or open circuit
B12DD11Tailgate lock motor – short circuit to ground
B12DD15Tailgate lock motor – short circuit to B+ or open circuit
B12DD92Tailgate lock motor – mechanical fault
B12FEF0Engine/Motor Control Module 2/power electronics 3, not authorized
B12FFF0High-voltage power electronics for front axle – immobilizer active
B1300F0High-voltage power electronics for rear axle – immobilizer active
B1301F0Servo motor (electric gear actuator) – immobilizer active
B1302F0Steering column lock control unit – immobilizer active
B130304Tailgate proximity sensor control unit – defective

All 616 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.