P0458: EVAP purge control valve circuit low
The ECU sees too low a voltage in the purge valve circuit. It is usually a wire shorting to earth, a connector or the valve’s own coil.
| Code | P0458 |
|---|---|
| System | Engine and transmission |
| Group | P04xx, Emissions control |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0458 means
The purge valve opens to let the engine draw in the petrol vapour stored in the charcoal canister. The ECU switches it electrically and monitors its circuit. Circuit low means it sees a voltage below what should be possible, nearly always an electrical fault.
Most common causes
- Loose or corroded connector on the purge valve
- Control wire shorted to earth or broken
- Purge valve coil shorted
- Fuse or supply to the valve at fault
- Rarely, a faulty ECU output
Symptoms
- Engine warning light on
- Sometimes a slightly uneven idle
- Possible petrol smell or hard starting after refuelling
Can you drive with P0458?
With care You can usually drive, but if the idle is rough or the car is hard to start after filling up, get it fixed soon.
Open the bonnetthe in-depth explanation
How to check it
With the engine running, trigger the purge valve from your scanner if it allows it: you should hear a ticking sound. If it stays silent, check the connector and wiring before replacing the valve.
How to read and clear P0458 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 P0458 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
- P0454 EVAP system pressure sensor intermittent signal
- P0455 EVAP system large leak detected
- P0456 EVAP system very small leak detected
- P0457 EVAP system leak: fuel cap loose or missing
- P0459 EVAP purge control valve circuit high
- P045A The exhaust gas recirculation B control has an electrical fault
- P045B The exhaust gas recirculation B control gives readings outside the normal range
- P045C The exhaust gas recirculation B control gives a lower signal than normal
- P0400 Exhaust gas recirculation (EGR) flow malfunction
- P0401 Exhaust gas recirculation (EGR) flow insufficient
- P0402 Exhaust gas recirculation (EGR) flow excessive
- P0403 EGR control circuit malfunction
What does code P0458 mean?
The purge valve opens to let the engine draw in the petrol vapour stored in the charcoal canister. The ECU switches it electrically and monitors its circuit. Circuit low means it sees a voltage below what should be possible, nearly always an electrical fault.
Can you drive with P0458?
You can usually drive, but if the idle is rough or the car is hard to start after filling up, get it fixed soon.
How do you clear P0458?
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, P0458 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.
