What this code means

The DPF ash accumulation (non-combustible residue from oil) has reached a level requiring cleaning or replacement. Ash cannot be removed by regeneration.

Symptoms

• DPF warning light
• Reduced engine performance
• Increased exhaust backpressure
• Regeneration less effective
• Fuel economy declining
• DPF replacement or cleaning message

Common causes

• Normal ash accumulation over mileage
• Excessive oil consumption increasing ash
• Wrong oil specification (high ash)
• Extended DPF service interval
• Frequent regeneration depositing more ash

Diagnostic steps

1. Measure DPF differential pressure at idle
2. Compare to ash loading model in ECM
3. Check engine oil consumption rate
4. Verify oil specification (low SAPS)
5. Review DPF mileage and service history

Repair notes

DPF professional cleaning (baking/pneumatic) or replacement. Use low-SAPS oil per manufacturer specification to minimize future ash buildup. Address any oil consumption issues.

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