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B10B921 — Left footwell flap motor, Lower limit not reached

Left footwell flap motor, Lower limit not reached. 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 B10B921

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 B10B921

  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 B10B921 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

B10AE21High pressure sensor, Lower limit not reached
B10AE22High pressure sensor, Upper limit exceeded
B10AF04Air quality sensor – fault value received
B10B904Servo motor for front left footwell outlet vent, faulty
B10B907Left footwell flap motor, mechanical malfunction
B10B91CLeft footwell flap motor, Voltage implausible
B10B922Left footwell flap motor, Upper limit exceeded
B10B94BLeft footwell flap motor, Excess temp.
B10BA04Servo motor for front right footwell outlet vent, faulty
B10BA07Right footwell flap motor, mechanical malfunction
B10BA1CRight footwell flap motor, Voltage implausible
B10BA21Right footwell flap motor, Lower limit not reached

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.