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B178A12 — Trunk emergency release – short circuit to B+
Trunk emergency release – short circuit to B+. 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 B178A12
How to read and clear B178A12
- 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 B178A12 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 Aerodynamics Control Unit
| B16F8F4 | Rear spoiler drive 1 - timeout while retracting |
| B16F8F5 | Rear spoiler, drive 1, warning message in instrument cluster requested |
| B16F8F6 | Rear spoiler, drive 1 - extension stop activated |
| B16F8FA | Rear spoiler, drive 1 - retraction stop activated by PSM |
| B16F8FB | Rear spoiler, drive 1, extension requested by PSM |
| B178A11 | Trunk emergency release – short circuit to ground |
| B178A13 | Trunk emergency release – open circuit |
| B178A19 | Trunk emergency release – current too high |
| B17DA13 | Terminal 30-2 – defective |
| B184211 | Wind deflector motor – short circuit to ground |
| B184212 | Wind deflector motor - short circuit to B+ |
| B184213 | Wind deflector motor – open circuit |
All 305 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.