P2458: Diesel particulate filter regeneration duration
The diesel particulate filter clean-out is taking longer than it should or never finishes. Short trips or a faulty sensor are the usual reasons.
| Code | P2458 |
|---|---|
| System | Engine and transmission |
| Group | P24xx, EGR, EVAP and particulate filter |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P2458 means
To empty the particulate filter, the ECU raises exhaust temperature and burns off the soot: this is regeneration. It has a maximum time to do it. If that time is exceeded, or regeneration keeps getting interrupted, it stores this code because the filter is not being cleaned properly.
Most common causes
- Short or town trips that stop regeneration before it finishes
- Faulty exhaust temperature sensor or bad reading
- Differential pressure sensor or its pipes giving wrong data
- Thermostat stuck open so the engine never warms up
- Weak oxidation catalyst that does not generate enough heat
- Injector or EGR fault producing excess soot
Symptoms
- Engine or DPF warning light on
- Fan keeps running after switching off
- Raised idle or hot smell after stopping
- Higher fuel consumption
- Possible loss of power
Can you drive with P2458?
With care You can drive with care. Sort it out soon, because if the filter is never cleaned it will clog and the car will go into limp mode.
Open the bonnetthe in-depth explanation
How to check it
On your scanner, check whether a regeneration is in progress, the estimated soot load and exhaust temperatures. If everything looks sensible, a steady motorway run without switching off usually lets it finish.
How to read and clear P2458 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 P2458 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
- P2454 Diesel particulate filter pressure sensor A circuit low
- P2455 Diesel particulate filter pressure sensor A circuit high
- P2456 The diesel particulate filter pressure sensor A fails now and then
- P2457 The exhaust gas recirculation cooling system gives readings outside the normal
- P2459 Diesel particulate filter regeneration frequency
- P245A The exhaust gas recirculation cooler bypass control has a broken or
- P245B The exhaust gas recirculation cooler bypass control gives readings outside the
- P245C The exhaust gas recirculation cooler bypass control gives a lower signal than
- P2400 EVAP leak detection pump control circuit open or faulty
- P2413 Exhaust gas recirculation (EGR) system performance
- P2414 O2 sensor exhaust sample error (bank 1, sensor 1)
- P2425 EGR cooler valve control circuit open or faulty
What does code P2458 mean?
To empty the particulate filter, the ECU raises exhaust temperature and burns off the soot: this is regeneration. It has a maximum time to do it. If that time is exceeded, or regeneration keeps getting interrupted, it stores this code because the filter is not being cleaned properly.
Can you drive with P2458?
You can drive with care. Sort it out soon, because if the filter is never cleaned it will clog and the car will go into limp mode.
How do you clear P2458?
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, P2458 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.
