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C109C29 — PSM OFF button – signal implausible
PSM OFF button – signal implausible. 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 C109C29
How to read and clear C109C29
- 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 C109C29 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 Central Electrics
| B2F0900 | Development code 9 |
| B2F1F00 | Development code 31 |
| C102A29 | Park Assist – internal fault |
| C107E54 | Headlight beam adjustment – not taught |
| C108000 | Headlight – tourist mode active |
| C109C11 | PSM OFF button – short circuit to ground |
| C10A700 | Rolling test mode active |
| C10B329 | Electric interior mirror button – signal implausible |
| C10CE11 | -AUTO HOLD- Button, Short circuit to ground |
| C10CE29 | -AUTO HOLD- Button, Implausible signal |
| C10EE00 | Rolling test mode - fault |
| C111811 | Lane change assistance button, Short circuit to ground |
All 1472 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.