Trouble codes › P2002
P2002 Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
Diesel emissions
P2002 means the diesel particulate filter (DPF) isn't trapping soot as well as it should, often a damaged filter or a bad pressure sensor.
On diesels, the particulate filter (DPF) traps soot. P2002 means the engine computer thinks the filter isn't trapping soot as well as it should, often because the filter is damaged or a sensor is misreading.
Usually drivable, but get it checked soon. A damaged DPF can lead to reduced power and a failed inspection.
Common causes
- A cracked or damaged DPF
- A faulty DPF differential pressure sensor or its hoses
- An exhaust leak before the DPF
Symptoms
- Check-engine light
- Black smoke from the tailpipe (if the DPF is cracked)
- Reduced power on some vehicles
What to check first
- Check the DPF pressure sensor hoses for cracks, melting or disconnection.
- Compare the DPF pressure reading at idle and under load with spec.
- Look for soot at the tailpipe after the DPF.
- Check for service bulletins and software updates for your engine.
What does P2002 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P2002No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P2002 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.