Home › Fault codes › B1B3904
B1B3904 — Right charge port door, sensor for contactless opening – defective
Right charge port door, sensor for contactless opening – defective. The Taycan, 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 B1B3904
How to read and clear B1B3904
- 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 B1B3904 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 On-Board Charger
| B1AA5F0 | High-voltage charger 2 - component protection active |
| B1AD100 | Control unit – function restriction |
| B1B3804 | Left charge port door, sensor for contactless opening – defective |
| B1B38F0 | Left charge port door, sensor for contactless opening – communication error |
| B1B38F1 | Left charge port door, sensor for contactless opening – contamination level exceeded |
| B1B38F2 | Left charge port door, sensor for contactless opening, anti-play prevention active |
| B1B39F0 | Right charge port door, sensor for contactless opening – communication error |
| B1B39F1 | Right charge port door, sensor for contactless opening – contamination level exceeded |
| B1B39F2 | Right charge port door, sensor for contactless opening, anti-play prevention active |
| B1E31F0 | Motor locking flap for energy supply, end position detection, implausible value |
| B200000 | Control unit – function restriction |
| B200100 | Control unit – wrong software version |
All 221 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.