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B1D9FF4 — Cell module 21, aging detected
Cell module 21, aging detected. The Taycan 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 B1D9FF4
How to read and clear B1D9FF4
- 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 B1D9FF4 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 Battery Energy Control Module
| B1D9EFE | Cell module 15, aging detected |
| B1D9EFF | Cell module 16, aging detected |
| B1D9FF0 | Cell module 17, aging detected |
| B1D9FF1 | Cell module 18, aging detected |
| B1D9FF2 | Cell module 19, aging detected |
| B1D9FF3 | Cell module 20, aging detected |
| B1D9FF5 | Cell module 22, aging detected |
| B1D9FF6 | Cell module 23, aging detected |
| B1D9FF7 | Cell module 24, aging detected |
| B1D9FF8 | Cell module 25, aging detected |
| B1D9FF9 | Cell module 26, aging detected |
| B1D9FFA | Cell module 27, aging detected |
All 198 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.