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B201700 — Immobiliser, authentication failed
Immobiliser, authentication failed. 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 B201700
How to read and clear B201700
- 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 B201700 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 Telematics Communication Unit
| B200096 | Control unit – function restriction |
| B2000F0 | Control unit – function restriction |
| B200500 | Coding |
| B2008F0 | Function restriction, temperature – above limit value |
| B2009F0 | Function restriction, temperature - below limit value |
| B201200 | Coding |
| C10A700 | Rolling test mode active |
| C10EE00 | Rolling test mode - fault |
| C11E1F0 | Emergency-call module, Function limitation due to mobile network availability |
| C11E1F1 | Emergency call module, Function restriction due to faulty coding |
| U042300 | Instrument cluster control unit – signal implausible |
| U045200 | Airbag control unit - signal implausible |
All 157 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.