Home › Fault codes › B129F29

B129F29 — Child Safety Lock Switch, Implausible signal

Child Safety Lock Switch, Implausible signal. 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 B129F29

Porsche Taycan

Door Module, Driver

Porsche 911 (992)

Tuer_FS (Tuere vorne Fahrerseite)

Porsche Panamera (971, 2017–2023)

Door Module, Driver

Porsche Panamera (972, 2024–)

Tuer_FS (Tuere vorne Fahrerseite)

Porsche Cayenne (9YA)

Door Module, Driver

How to read and clear B129F29

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and B129F29 shows with its status, its full description and the freeze frame when the unit stores one.
  3. 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 reading

Other codes of the Door Module, Driver

B122B13Central locking motors, Open circuit
B122D29Lock unit for central locking, Implausible signal
B122F29Contact switch for lock cylinder, Implausible signal
B123029Button for interior lock, Implausible signal
B125F01Closing assist motor, Electrical error
B125F4BClosing Assist Motor, Excess temperature
B131629Mirror selector switch, Implausible signal
B131701Automatic dimming outside mirror, Electrical malfunction
B131B29Interior monitoring/vehicle inclination sensor button, Implausible signal
B131F01Rear window regulator, driver side, Electrical error
B131F54Rear window regulator, driver side, No basic setting
B131FF2Rear window regulator, driver side, not coded

All 107 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.