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U028500 — Servo motor for cooling-air flaps, left (SM2) – no communication
Servo motor for cooling-air flaps, left (SM2) – 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 U028500
How to read and clear U028500
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and U028500 shows with its status, its full description and the freeze frame when the unit stores one.
- 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 readingOther codes of the Thermal Management
| U019900 | Driver-side door control unit - no communication |
| U019B00 | High-voltage charger (OBC) control unit – missing message |
| U020000 | Door control unit, passengerʼs side - no communication |
| U020100 | Control unit for door on rear driver’s side - no communication |
| U020200 | Control unit for door on rear passenger’s side - no communication |
| U028400 | Servo motor for cooling-air flaps, right (SM1) – no communication |
| U029200 | Front-axle high-voltage power electronics control unit - no communication |
| U029800 | Control unit for high-voltage voltage converter (combi converter) - missing message |
| U029900 | Control unit for high-voltage voltage converter (booster) - missing message |
| U029B00 | High-voltage power electronics 3 control unit - missing message |
| U02AD00 | Boost pressure actuator for turbocharger 2, no communication |
| U032A00 | Electric air-conditioning compressor (V470), part number implausible |
All 636 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.