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B173A11 — Rear external activation, Short circuit to Ground (GND)

Rear external activation, Short circuit to Ground (GND). The Taycan, 911 (992), 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 B173A11

Porsche Taycan

Front Assist Camera

Porsche 911 (992)

ZFAS (Zentrales Fahrer Assistenz System)

Porsche Panamera (972, 2024–)

ZFAS (Zentrales Fahrer Assistenz System)

Porsche Cayenne (9YA)

ZFAS (Zentrales Fahrer Assistenz System)

How to read and clear B173A11

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and B173A11 shows with its status, its full description and the freeze frame when the unit stores one.
  3. 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 →

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Other codes of the Front Assist Camera

B15EC14Voltage supply for front parking aid sensor, Open circuit/short circuit to ground
B163002Function restriction, route data not loaded
B16FB29Automated driving button, Implausible signal
B170AF1Data synchronization for image processing not complete
B172F11Front external activation, Short circuit to Ground (GND)
B172F12Front external activation, Short circuit to B+
B173A12Rear external activation, Short circuit to B+
B1792F1Trailer positioning assistant, Poor image quality
B1792F2Trailer positioning assistant, Not available
B1792F4Trailer positioning assistant, Software error detected
B1792F5Trailer positioning assistant, Initialization of software failed
B1792F6Trailer positioning assistant, Input data from regulator implausible

All 336 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.