P2458 code meaning
Diesel Particulate Filter Regeneration Duration
Powertrain system Generic code P24xx codes Check engine light
What P2458 means
During a regeneration the engine raises exhaust temperature, mostly by late post-injection burned in the oxidation catalyst, until the soot in the particulate filter oxidises. P2458 means a regeneration took longer than the calibrated limit, so the filter was not cleaned in the expected time. CARB asks diesel OBD to detect regenerations that do not complete as intended. On the Opel/GM 2.0 CDTi in the Saab 9-5 (2010) the ECM runs the check with coolant at 73 to 96 °C and sets the code when regeneration times are too long; it is a Type C code there, stored without the MIL. Volkswagen saw P2458 with the MIL on 2011 Jetta and Golf 2.0 TDI (CJAA) and fixed it with an ECM software update, so the calibration is worth checking before parts are replaced. Otherwise the regeneration is slowed by low exhaust temperature, a weak oxidation catalyst, faulty temperature or pressure readings, or trips too short to finish. P2459 covers regenerations that happen too often.
P2458 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2458
- DPF warning or MIL, depending on the manufacturer
- Cooling fan and raised idle running on after shutdown
- Higher fuel consumption
Common causes of P2458
- PossibleECM calibration that needs an update (documented by Volkswagen)
- PossibleShort trips that keep regenerations from finishing
- Less likelyOxidation catalyst too weak to reach regeneration temperature
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Diesel particulate filterDiesel oxidation catalystExhaust gas temperature sensorDPF differential pressure sensorECM
What each part of P2458 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 58 | The exact fault in that area. |
What to do next
- Note P2458 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2458
What does P2458 mean?
P2458 means "Diesel Particulate Filter Regeneration Duration". During a regeneration the engine raises exhaust temperature, mostly by late post-injection burned in the oxidation catalyst, until the soot in the particulate filter oxidises. It is a generic code, so it means the same on every make.
Is it safe to drive with P2458?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2458 fail an emissions test?
Yes, it can. P2458 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2458 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2458 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.