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U18EA00 — Backend Real Time Monitoring, root certificate has expired
Backend Real Time Monitoring, root certificate has expired. The Taycan, 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 U18EA00
How to read and clear U18EA00
- 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 U18EA00 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 Diagnostic Unit
| U183900 | Real-time monitoring, local caching overloaded |
| U184A00 | Backend Real Time Monitoring, registration of the APN access point failed |
| U18E600 | Backend Real Time Monitoring, DNS requests failed |
| U18E700 | Backend Real Time Monitoring, TCP connection failed |
| U18E800 | Backend Real Time Monitoring, Authorized backend connection failed |
| U18E900 | Backend real time monitoring, logging failed |
| U18EB00 | Backend Real Time Monitoring, registration failed |
All 51 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.