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C135CF1 — Data bus – incorrect value received

Data bus – incorrect value received. 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 C135CF1

Porsche Taycan

Brake Electronics

Porsche 911 (992)

Brake Electronics

Porsche Panamera (971, 2017–2023)

Brake Electronics

Porsche Panamera (972, 2024–)

Brake Electronics

Porsche Cayenne (9YA)

Brake Electronics

How to read and clear C135CF1

  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 C135CF1 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 Brake Electronics

C1337F5Brake electronics – forced activation by engine control unit
C1337F6Brake electronics – forced activation disabled
C1337F7Brake electronics – forced activation by rear axle steering
C1337F8Forced brake activation by development function
C135C96Brake electronics – internal error
C135CF0Brake electronics control module, Brake Booster function limitation
C135CF2Data bus – incorrect value received
C135CF3Recuperation – malfunction
C135CF4Brake electronics – cooling flap position implausible
C135CF5Brake electronics – implausible signal from instrument cluster
C135CF6Brake electronics – missing message from instrument cluster
C135CF7Brake electronics – missing message from brake booster

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.