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B129AF5 — Display 4 – supply voltage below lower limit value
Display 4 – supply voltage below lower limit value. 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 B129AF5
How to read and clear B129AF5
- 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 B129AF5 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 Information Control Unit
| B129A04 | Display 4 – defective |
| B129A06 | Display 4 – software error |
| B129AF0 | Display 4, touch-sensitive input field – software error |
| B129AF1 | Display 4, background lighting – open circuit |
| B129AF2 | Display 4, temperature – upper limit exceeded |
| B129AF4 | Display 4 – supply voltage above upper limit value |
| B129AF6 | Display 4 – touch-sensitive input field defective |
| B129AF7 | Display 4 – short circuit |
| B129AF8 | Display 4 – no communication |
| B129AF9 | Display 4, line for video signal (LVDS) – open circuit |
| B129B11 | Microphone 1 - short circuit to ground |
| B129B12 | Microphone 1 - short circuit to B+ |
All 614 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.