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B18DDF3 — Emergency call test mode, Backup battery function restriction
Emergency call test mode, Backup battery function restriction. 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 B18DDF3
How to read and clear B18DDF3
- 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 B18DDF3 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
| B18CE11 | W-LAN antenna 2, short circuit to ground |
| B18CE12 | W-LAN antenna 2, short circuit to B+ |
| B18CE13 | W-LAN antenna 2, open circuit |
| B18DDF0 | Emergency call test mode, Microphone function restriction |
| B18DDF1 | Emergency call test mode, Loudspeaker function restriction |
| B18DDF2 | Emergency call test mode, Airbag function restriction |
| B18DDF4 | Emergency call test mode, LED display function restriction |
| B18DDF5 | Emergency call test mode, Emergency call button function restriction |
| B18F4F0 | Crash signal from airbag control module, implausible |
| B18F4F1 | Crash signal from airbag control module, permanently on high level |
| B18F4F2 | Crash signal from airbag control module, permanently on low level |
| B191604 | Backup battery, Faulty |
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.