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U115400 — Control unit for windshield heating – no communication

Control unit for windshield heating – no communication. 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 U115400

Porsche Taycan

Comfort System Module

Porsche 911 (992)

BCM2 (Body Control Module 2)

Porsche Panamera (971, 2017–2023)

BCM2 (Body Control Module 2)

Porsche Panamera (972, 2024–)

BCM2 (Body Control Module 2)

Porsche Cayenne (9YA)

BCM2 (Body Control Module 2)

How to read and clear U115400

  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 U115400 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 Comfort System Module

U113700Alarm siren – message implausible
U113800Alarm system sensors (in roof console) – message implausible
U115000Rear spoiler adjustment control module, No communication
U115100Rear spoiler adjustment control module, implausible message
U115200Tailgate proximity sensor control unit – no communication
U115300Tailgate proximity sensor control unit – message implausible
U115500Windshield defogger control module, implausible message
U120000Data bus, Faulty
U120100Data bus, No communication
U140000Function restriction – supply voltage too low
U140100Function restriction – supply voltage too high
U140A00Terminal 30 supply voltage – open circuit

All 616 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.