Fault-Code Library · DPF
P2002: Diesel particulate filter efficiency below threshold
The ECU calculates that particulate-filter performance is below its required threshold.
Common symptoms
- •DPF warning
- •Frequent regeneration
- •Reduced power
- •Higher fuel use
Likely causes
- •Ash-loaded or damaged DPF
- •Differential-pressure sensor fault
- •Exhaust leak
- •Underlying soot-production problem
First checks
- •Read soot and ash estimates
- •Check pressure values with engine off and under load
- •Inspect temperature sensors and regeneration history
Important
Forced regeneration is unsafe when loading, oil level, or temperature-sensor data is not understood.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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