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B135A29 — Lumbar support fore/aft adjustment sensor, Implausible signal

Lumbar support fore/aft adjustment sensor, 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 B135A29

Porsche Taycan

Seat Module, DriverSeat Module, Passenger

Porsche 911 (992)

Seat Module, DriverSeat Module, Passenger

Porsche Panamera (971, 2017–2023)

Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger Side

Porsche Panamera (972, 2024–)

Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger Side

Porsche Cayenne (9YA)

Seat Module, DriverSeat Module, Passenger

How to read and clear B135A29

  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 B135A29 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 Seat Module, Driver

B135813Seat belt height adjustment motor, Open circuit
B13584BSeat belt height adjustment motor, temperature - above limit value
B135854Seat belt height adjustment motor, No basic setting
B135911Lumbar support height adjustment sensor, Short circuit to ground
B135929Lumbar support height adjustment sensor, Implausible signal
B135A11Lumbar support fore/aft adjustment sensor, Short circuit to ground
B135B11Seat tilt adjustment sensor, Short circuit to ground
B135B29Seat tilt adjustment sensor, Implausible signal
B135C11Seat height adjustment sensor, Short circuit to ground
B135C29Seat height adjustment sensor, Implausible signal
B135D11Seat fore/aft adjustment sensor, Short circuit to ground
B135D29Seat fore/aft adjustment sensor, Implausible signal

All 222 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.