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B178201 — Function lighting button interior monitoring, Electrical error
Function lighting button interior monitoring, Electrical error. 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 B178201
How to read and clear B178201
- 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 B178201 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 Door Module, Driver
| B16FF01 | Sensor for door heating element 2, Electrical malfunction |
| B177501 | Door warning light / entry light, Electrical error |
| B177802 | Exterior door handle touch sensor, Signal error |
| B177901 | Function lighting child safety, Electrical error |
| B178001 | Function lighting button interior locking, Electrical error |
| B178101 | Function lighting button lane change assistance, Electrical error |
| B178301 | Function lighting central locking, Electrical error |
| B178901 | Function lighting display LED lane change assistance, Electrical error |
| B179001 | Function lighting memory seat LED, Electrical error |
| B179101 | Function lighting exit alerter LED, Electrical error |
| B187629 | Window control unit, Implausible signal |
| B18B401 | Exterior door handle actuator, Electrical malfunction |
All 107 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.