Fault-Code Library · DPF
P2458: DPF regeneration duration
A diesel particulate filter regeneration took too long or did not complete as expected.
Common symptoms
- •DPF warning
- •Cooling fans running often
- •Reduced power
- •Fuel economy drop
Likely causes
- •Short-trip driving
- •Thermostat not reaching temperature
- •DPF pressure sensor fault
- •Excess soot from EGR, injector, or boost issues
First checks
- •Check coolant temperature and thermostat behavior
- •Read soot load and pressure values
- •Review regeneration history and driving pattern
Important
Repeated incomplete regeneration can dilute oil and push the DPF into a high-risk soot load.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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