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B121102 — Hall-effect sensor for lid actuating cylinder, rear left - signal error
Hall-effect sensor for lid actuating cylinder, rear left - signal error. 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 B121102
How to read and clear B121102
- 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 B121102 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 Deck Lid Control Unit
| B11DF11 | Rear buzzer cover - short to ground |
| B11DF12 | Rear buzzer cover - short to B+ |
| B11DF13 | Rear buzzer cover - open circuit |
| B120A02 | Hall-effect sensor for lid actuating cylinder, right - signal error |
| B120A11 | Hall-effect sensor for lid actuating cylinder, right - short circuit to ground |
| B120A15 | Hall-effect sensor for lid actuating cylinder, right - open circuit/short circuit to B+ |
| B121111 | Hall-effect sensor for lid actuating cylinder, rear left - short circuit to ground |
| B121115 | Hall-effect sensor for lid actuating cylinder, rear left - open circuit/short circuit to B+ |
| B12E011 | Closing-aid motor for rear lid - short circuit to ground |
| B12E015 | Closing-aid motor for rear lid - open circuit/short circuit to B+ |
| B12EE11 | Sensor for luggage compartment cover - short circuit to ground |
| B12EE29 | Luggage compartment cover sensor, Implausible signal |
All 60 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.