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C105900 — Left rear tire, Tire pressure warning - flat tire
Left rear tire, Tire pressure warning - flat tire. 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 C105900
How to read and clear C105900
- 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 C105900 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 Brake Electronics
| C104AF0 | Control module, Incorrect Vehicle Identification Number (VIN) |
| C105400 | Left front tire, Tire pressure warning - too low |
| C105500 | Left front tire, Tire pressure warning - flat tire |
| C105600 | Right front tire, Tire pressure warning - too low |
| C105700 | Right front tire, Tire pressure warning - flat tire |
| C105800 | Left rear tire, Tire pressure warning - too low |
| C105A00 | Right rear tire, Tire pressure warning - too low |
| C105B00 | Right rear tire, Tire pressure warning - flat tire |
| C106900 | Control difference |
| C106AF0 | ABS valves supply voltage, implausible |
| C106B29 | Wheel speed sensor, Implausible signal |
| C109C07 | ASR/ESP button, mechanical malfunction |
All 317 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.