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B16F904 — Roof electronics control module 2, faulty

Roof electronics control module 2, faulty. 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 B16F904

Porsche Taycan

Central Electrics

Porsche 911 (992)

BCM1 (Body Control Module 1)

Porsche Panamera (971, 2017–2023)

BCM1 (Body Control Module 1)

Porsche Panamera (972, 2024–)

BCM1 (Body Control Module 1)

Porsche Cayenne (9YA)

BCM1 (Body Control Module 1)

How to read and clear B16F904

  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 B16F904 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 Central Electrics

B16F401Left rear interior lamp, Electrical malfunction
B16F404Left rear interior lamp, faulty
B16F501Right rear interior lamp, Electrical malfunction
B16F504Right rear interior lamp, faulty
B16F601Left rear reading lamp 2, Electrical malfunction
B16F701Right rear reading lamp 2, Electrical malfunction
B16F916Roof electronics control module 2, Voltage too low
B16F917Roof electronics control module 2, voltage too high
B16F9F0Roof electronics control module 2, Rear reading lamp button, left, implausible signal
B16F9F1Roof electronics control module 2, Rear reading lamp button, right, implausible signal
B16F9F2Roof electronics control module 2, Rear interior lamp rear button, implausible signal
B170001Indicator lamp for cupholder heating function, Electrical error

All 1472 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.