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C121E00 — Operational readiness (terminal 15), implausible signal

Operational readiness (terminal 15), implausible signal. The Taycan 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 C121E00

Porsche Taycan

Drive Motor Control Module

How to read and clear C121E00

  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 C121E00 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

B12FDF1Immobilizer – key invalid
B12FDF4Immobilizer deactivated
B184C00Release active
B2F0100Development code 1
C109F00Coding
C116300Development functions active
C12D600remote controlled parking
P056200Supply voltage - voltage too low
P056300Supply voltage too high
P060100Function restriction
P060200Programming
P060300Control unit - function restriction

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.