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B16F401 — Left rear interior lamp, Electrical malfunction

Left rear interior lamp, Electrical malfunction. 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 B16F401

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 B16F401

  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 B16F401 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

B16EE17Rear A/C Control Head 6, voltage too high
B16EEF0Rear A/C Control Head 6, Hardware coding, electrical malfunction
B16EEF1Rear A/C Control Head 6, Button signal implausible
B16F011Left signature light bulb, supply, Short circuit to Ground (GND)
B16F111Right signature light bulb, supply, Short circuit to Ground (GND)
B16F301Rear interior light, 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
B16F904Roof electronics control module 2, faulty

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.