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C127504 — Module for external sensors, faulty
Module for external sensors, 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 C127504
How to read and clear C127504
- 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 C127504 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 Light Control Left
| C123BF3 | Front marker light – voltage too low |
| C123BF7 | Bulb for parking light, Overtemperature protection active |
| C123BFA | Front marker light – short circuit |
| C123BFB | Front marker light, above normal temperature |
| C123BFC | Front marker light, below normal temperature |
| C125301 | LED-activation interface, Electrical error |
| C127517 | Module for external sensors, voltage too high |
| C128301 | Auxiliary headlight – electrical fault |
| C128304 | Laser beam, faulty |
| C128311 | Laser beam, Short circuit to Ground (GND) |
| C128313 | Auxiliary headlight – open circuit |
| C1283F0 | Auxiliary headlight, coding resistance – electrical fault |
All 223 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.