P2458: Diesel particulate filter regeneration duration
The diesel particulate filter’s self-cleaning (regeneration) takes too long or happens too often.
Updated
What P2458 means
A diesel particulate filter (DPF) cleans itself by burning off the soot it has caught: a regeneration. On longer drives this happens by itself; when the filter gets fuller, the engine computer starts one by raising the exhaust temperature.
The computer keeps track of how long each regeneration takes and how often they’re needed. P2458 means a regeneration took too long to finish.
P2459: regenerations too often
P2459 means the filter needs regenerating more often than the engine computer expects. The advice is the same and the causes overlap; for P2459, an engine fault that makes extra soot, or a pressure sensor that reads high, are the first suspects.
P2459: Diesel particulate filter regeneration frequency
Can I keep driving?
Check soon
Probably OK to drive short-term, but have it checked soon. Fuel use or emissions may be worse.
General guidance based on the code alone, not on the car’s actual condition. If in doubt, stop and ask a mechanic.
Left alone, a filter that can’t finish its regenerations keeps filling up, which can end in a clogged filter (P2463) and limp mode.
Symptoms
- A particulate filter warning on the dashboard, on many cars.
- Signs of frequent regenerations: the cooling fan running after switching off, or a higher idle.
- Higher fuel use, or less power.
Common causes
- Mostly short trips, so regenerations keep being interrupted. A regeneration needs a hot exhaust for a while. Switching off halfway starts it over next time.
- Faulty differential pressure or exhaust temperature sensor. The computer judges the filter and the regeneration by these readings.
- Engine fault causing extra soot. For example an EGR, injector or boost fault. Fix that first, or the filter fills again.
Typical fixes
- Read the other codes too, and fix any engine fault that makes extra soot.
- If your handbook recommends it, a longer drive at a steady speed lets a regeneration finish.
- Have the differential pressure sensor, its hoses and the exhaust temperature sensors checked.
- Have a regeneration started with a tool for your make, or the filter cleaned or replaced if it’s full of ash late in its life.
Questions
Can I drive with P2458?
Probably for a short time, but have it checked soon: the app’s advice is that fuel use or emissions may be worse. If the car goes into limp mode, don’t leave it.
Will a long drive fix P2458?
Sometimes, if short trips were the problem and the car can regenerate on the move. Follow your handbook. If the code comes back, have the sensors and the engine checked.