Home › Fault codes › B10921C
B10921C — Recirculation flap motor, Voltage implausible
Recirculation flap motor, Voltage implausible. 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 B10921C
How to read and clear B10921C
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and B10921C shows with its status, its full description and the freeze frame when the unit stores one.
- 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 readingOther codes of the Central Electrics
| B10901C | Defroster flap motor, Voltage implausible |
| B109021 | Defroster flap motor, Lower limit not reached |
| B109022 | Defroster flap motor, Upper limit exceeded |
| B10904B | Defroster flap motor, Excess temp. |
| B109204 | Servo motor for front recirculation flap - faulty |
| B109207 | Recirculation flap motor, mechanical malfunction |
| B109221 | Recirculation flap motor, Lower limit not reached |
| B109222 | Recirculation flap motor, Upper limit exceeded |
| B10924B | Recirculation flap motor, Excess temp. |
| B109304 | Rear air distribution door motor, Faulty |
| B109307 | Rear air distribution door motor, mechanical malfunction |
| B10931C | Rear air distribution door motor, Voltage implausible |
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.