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P304900 — Starter relay 2 - open circuit

Starter relay 2 - open circuit. 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 P304900

Porsche Panamera (971, 2017–2023)

Engine Control Module 1

Porsche Cayenne (9YA)

Engine Control Module 1

How to read and clear P304900

  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 P304900 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

P288600Shift monitoring, dog clutch, selection attempt failed
P2B6400Additional coolant pump (P5) – temperature too high
P2B6500Additional coolant pump (P5) – dry run
P304000Transmission position implausible
P304700Starter relay 2 - short circuit to B+
P304800Starter relay 2 - short circuit to ground
P305000Starter relay 2 - does not switch
P305200Terminal 50, feedback line - short circuit to B+
P305300Terminal 50, feedback line - short circuit to ground/open circuit
P305400Starter does not turn, Mechanically blocked or electrical malfunction
P308800Starter relay 1/2 - electrical fault
U002800Hybrid CAN bus – faulty

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.