P2340: Cylinder 5 exceeds the knock threshold
Cylinder 5 exceeds the knock threshold. Continued knocking can damage the engine.
| Code | P2340 |
|---|---|
| System | Engine and transmission |
| Group | P23xx, Ignition coils and engine |
| Type | Generic: it means the same on every make |
How to read and clear P2340 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 P2340 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
- P233C The fuel pressure regulator C control gives a higher signal than normal
- P233D The fuel pressure regulator B solenoid power supply voltage control has a
- P233E The fuel pressure regulator B solenoid power supply voltage control gives a
- P233F The fuel pressure regulator B solenoid power supply voltage control gives a
- P2341 Cylinder 6 exceeds the knock threshold
- P2342 Cylinder 7 exceeds the engine knock threshold
- P2343 Cylinder 8 exceeds the engine knock threshold
- P2344 Knock in cylinder 9 exceeds the expected threshold
- P2300 Ignition coil A primary control circuit low
- P2301 Ignition coil A primary control circuit high
- P2303 Ignition coil B primary control circuit low
- P2304 Ignition coil B primary control circuit high
What does code P2340 mean?
Cylinder 5 exceeds the knock threshold. Continued knocking can damage the engine.
How do you clear P2340?
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, P2340 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.
