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B18C8FA — Authentication error - lower air conditioning control panel connection
Authentication error - lower air conditioning control panel connection. 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 B18C8FA
How to read and clear B18C8FA
- 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 B18C8FA 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 Information Control Unit
| B18C8F3 | HDCP authentication error: display device certificate |
| B18C8F4 | HDCP authentication error: display device certificate |
| B18C8F5 | HDCP authentication error to center display LVDS interface |
| B18C8F6 | HDCP authentication error to center display LVDS interface |
| B18C8F7 | HDCP authentication error to center display LVDS interface |
| B18C8F9 | HDCP authentication error - passenger display certificate |
| B18C8FB | HDCP authentication error on LVDS interface for passenger display |
| B18C8FC | HDCP authentication error, certificate for display 4 |
| B18C913 | Coupling antenna for mobile devices, Open circuit |
| B18CA01 | Antenna for coupling antenna for mobile devices, Electrical malfunction |
| B18D3F2 | Functions which can be activated, Invalid control module configuration |
| B18D3F4 | Function activation – authentication failed |
All 614 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.