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P305400 — Starter does not turn, Mechanically blocked or electrical malfunction
Starter does not turn, Mechanically blocked or electrical malfunction. The Panamera (971) 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 P305400
How to read and clear P305400
- 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 P305400 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 Engine Control Module 1
| P304700 | Starter relay 2 - short circuit to B+ |
| P304800 | Starter relay 2 - short circuit to ground |
| P304900 | Starter relay 2 - open circuit |
| P305000 | Starter relay 2 - does not switch |
| P305200 | Terminal 50, feedback line - short circuit to B+ |
| P305300 | Terminal 50, feedback line - short circuit to ground/open circuit |
| P308800 | Starter relay 1/2 - electrical fault |
| U002800 | Hybrid CAN bus – faulty |
| U002900 | Hybrid CAN bus - no communication |
| U008000 | FlexRay data bus - synchronization |
| U009200 | LIN bus 1 – electrical fault |
| U009300 | LIN bus 1 – no communication |
All 206 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.