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U030400 — Selector support, software incompatible

Selector support, software incompatible. The Taycan 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 U030400

Porsche Taycan

Engine Control Module 1

Porsche Cayenne (9YA)

Torque Converter (Transmission)

How to read and clear U030400

  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 U030400 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 Engine Control Module 1

U025900Special vehicles control unit - no communication
U028A00Transmission oil pump – electrical fault
U029200Front-axle high-voltage power electronics control unit - no communication
U029900Control unit for high-voltage voltage converter (booster) - missing message
U029B00High-voltage power electronics 3 control unit - missing message
U030100Motor electronics (DME) software control unit faulty
U040200Transmission control unit, signal implausible
U040400Selector support – implausible signal
U041100High-voltage power electronics control unit – signal implausible
U041300High-voltage battery control unit, signal implausible
U041500Control unit for brake electronics (PSM) – signal implausible
U041600Data bus - fault value received

All 274 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.