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P077D00 — Speed sensor, transmission output - short circuit to B+

Speed sensor, transmission output - short circuit to B+. 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 P077D00

Porsche Taycan

Drive Motor Control Module

Porsche Cayenne (9YA)

Torque Converter (Transmission)

How to read and clear P077D00

  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 P077D00 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 Drive Motor Control Module

P071100(Transmission oil) temperature sensor – implausible signal
P072000Speed sensor, transmission output – electrical fault
P072100Speed sensor, transmission output – signal implausible
P072200Speed sensor, transmission output - no signal
P072300Transmission output speed sensor, misfire
P077C00Speed sensor, transmission output – short circuit to ground
P0A0100Medium-temperature circuit – temperature implausible (TW5/TW9/TW10)
P0A1B00High-voltage power electronics faulty
P0A2B00Electric machine, temperature sensor – signal implausible
P0A2C00Electric machine, temperature sensor – short circuit to ground
P0A2D00Electric machine - temperature sensor – short circuit to B+/open circuit
P0A2E00Electric machine, temperature sensor – dropouts

All 143 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.