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B178E04 — Instrument panel ambient lighting lamp 1, faulty
Instrument panel ambient lighting lamp 1, faulty. 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 B178E04
How to read and clear B178E04
- 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 B178E04 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
| B177629 | Button sunroof shade button, rear, Implausible signal |
| B177F11 | Ionizer electrode needle, Short circuit to Ground (GND) |
| B177F13 | Ionizer electrode needle, Open circuit |
| B178B04 | Front center console ambient lighting bulb 6, faulty |
| B178C04 | Front center console ambient lighting bulb 7, faulty |
| B178D04 | Front center console ambient lighting bulb 8, faulty |
| B178F04 | Instrument panel ambient lighting lamp 2, faulty |
| B1792F3 | Trailer positioning assistant, safe condition adapted |
| B179A04 | Instrument panel ambient lighting lamp 3, faulty |
| B179B04 | Instrument panel ambient lighting lamp 4, faulty |
| B179E04 | Front ambient light, front left door storage box (AL12) – defective |
| B179F04 | Front ambient light, front right door storage box (AL16) – defective |
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.