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B185C04 — Rear left seat heating - temperature sensor in seat cushion faulty

Rear left seat heating - temperature sensor in seat cushion faulty. The Taycan, 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 B185C04

Porsche Taycan

Air Conditioning

Porsche Panamera (971, 2017–2023)

Air Conditioning

Porsche Panamera (972, 2024–)

Air Conditioning

Porsche Cayenne (9YA)

Air Conditioning

How to read and clear B185C04

  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 B185C04 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 Air Conditioning

B185A17Rear left seat heating - overvoltage
B185A29Rear left seat heating - message implausible
B185A87Rear left seat heating - no communication
B185A98Rear left seat heating - overtemperature
B185AF0Rear left seat heating - coding
B185B19Rear left seat heating - seat cushion, current too high
B185D04Neck heating button, faulty
B185D29Neck heating button, Implausible signal
B185D87Neck heating button, Missing message
B185E16Supply voltage for sensor actuators (12V) - vehicle, above limit value
B185E17Supply voltage for sensor actuators (12V) - vehicle, below limit value
B186F04Rear electric needle air ionizer - faulty

All 418 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.