Home › Fault codes › B170401
B170401 — Interior lighting button – electrical fault
Interior lighting button – electrical fault. 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 B170401
How to read and clear B170401
- 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 B170401 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 Central Electrics
| B16F917 | Roof electronics control module 2, voltage too high |
| B16F9F0 | Roof electronics control module 2, Rear reading lamp button, left, implausible signal |
| B16F9F1 | Roof electronics control module 2, Rear reading lamp button, right, implausible signal |
| B16F9F2 | Roof electronics control module 2, Rear interior lamp rear button, implausible signal |
| B170001 | Indicator lamp for cupholder heating function, Electrical error |
| B170101 | Indicator lamp for cupholder cooling function, Electrical error |
| B170501 | Button for rear reading light – electrical fault |
| B170601 | Button for front left reading light – electrical fault |
| B170701 | Button for front right reading light – electrical fault |
| B170801 | Left head area heater button, Electrical error |
| B170901 | Right head area heater button, Electrical error |
| B170B29 | Marker light button – signal implausible |
All 1472 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.