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B177A04 — Servo motor for center front right vertical vent – defective

Servo motor for center front right vertical vent – defective. 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 B177A04

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 B177A04

  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 B177A04 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 →

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Other codes of the Air Conditioning

B176D04Servo motor for center rear right horizontal vent – defective
B176D09Servo motor for center rear right horizontal vent – component fault
B176E04Servo motor for front left center horizontal vent – defective
B176E09Servo motor for front left center horizontal vent – component fault
B176F04Servo motor for center front left vertical vent – defective
B176F09Servo motor for front left center vertical vent – component fault
B177A09Servo motor for front right center vertical vent – component fault
B177B04Servo motor for rear left center horizontal vent – defective
B177B09Servo motor for center rear left horizontal vent – component fault
B177C04Servo motor for center rear left vertical vent – defective
B177C09Servo motor for center rear left vertical vent – component fault
B177D04Servo motor for center rear right vertical vent – defective

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.