P2509: The engine control unit supply voltage fails intermittently
The engine control unit supply voltage fails intermittently.
| Code | P2509 |
|---|---|
| System | Engine and transmission |
| Group | P25xx, Auxiliary inputs and electrical system |
| Type | Generic: it means the same on every make |
How to read and clear P2509 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2509 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2505 There is a fault in the engine control unit supply voltage
- P2506 The engine control unit supply voltage is out of range or behaves abnormally
- P2507 The engine control unit supply voltage is low
- P2508 The engine control unit supply voltage is too high
- P250A The engine oil level sensor has an electrical fault
- P250B The engine oil level sensor gives readings outside the normal range
- P250C The engine oil level sensor gives a lower signal than normal
- P250D The engine oil level sensor gives a higher signal than normal
- P2563 Turbocharger boost control position sensor A range/performance
What does code P2509 mean?
The engine control unit supply voltage fails intermittently.
How do you clear P2509?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2509 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
