Common Symptoms
- Check engine light illuminated
- Reduced engine power or performance
- Frequent regeneration cycles
- Poor fuel economy
- Excessive black smoke from exhaust
- Engine derate or limp mode
Most Likely Root Causes
- Clogged or restricted diesel particulate filter
- Failed or incomplete DPF regeneration cycles
- Faulty differential pressure sensor
- Contaminated engine oil or incorrect oil type
- Malfunctioning fuel injectors causing excess soot
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Component Location
The diesel particulate filter is located in the exhaust system downstream of the turbocharger and upstream of the muffler.
Manufacturer Notes
Many diesel manufacturers recommend performing a stationary forced regeneration before replacing the DPF to rule out incomplete regeneration as the cause.
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