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P078000 — Shift monitoring

Shift monitoring. 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 P078000

Porsche Taycan

Engine Control Module 1

Porsche Cayenne (9YA)

Torque Converter (Transmission)

How to read and clear P078000

  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 P078000 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 Engine Control Module 1

P069900Sensor voltage 3 - short circuit to B+
P06E900Starter does not turn, Mechanically blocked or electrical malfunction
P06EF00Engine Restart Performance
P071000Temperature sensor (transmission oil) - electrical fault
P071100(Transmission oil) temperature sensor – implausible signal
P072100Speed sensor, transmission output – signal implausible
P07A500Dog clutch – does not separate
P07B600Transmission Park Position Sensor/Switch "A" Circuit, Performance High
P080A00Multi-plate clutch, 2nd gear – adaptation required
P085D00Selector support – malfunction
P089400Coasting (transmission) – mechanical fault
P091900Selector support - fault

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.