What does P2002 mean?
The computer thinks soot is getting past the diesel particulate filter. It watches the DPF pressure drop; if it is lower than expected, the filter may be cracked or melted, or the sensor may be reading wrong.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Possible black soot in the tailpipe
- Usually no drop in power
Common causes
- Cracked or melted DPF (often after an uncontrolled regen)
- Faulty DPF pressure sensor or hose
- Leak in the exhaust before the sensor ports
- DPF missing or modified
How to diagnose P2002
- Check the DPF pressure sensor and its hoses first.
- Check for soot at the tailpipe. A clean DPF should leave the tailpipe almost clean.
- Look for exhaust leaks.
- Inspect the DPF face for cracks or melting if the sensor checks out.
How to fix it
- Replace the DPF pressure sensor or hoses
- Repair exhaust leaks
- Replace the DPF
Estimated repair cost
Likely repairs for P2002 run from about $150 to $7,000, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| DPF differential pressure sensor | $150 - $500 |
| DPF replacement (pickup) | $2,000 - $7,000 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P2002?
Moderate severity
Usually drivable, but have it checked. A cracked DPF will not pass emissions.
P2002 FAQ
What does P2002 mean?
P2002 stands for "Diesel Particulate Filter Efficiency Below Threshold (Bank 1)". The computer thinks soot is getting past the diesel particulate filter.
Can I drive with a P2002 code?
Usually drivable, but have it checked. A cracked DPF will not pass emissions.
How much does it cost to fix P2002?
It depends on the cause. The likely repairs for P2002 range from about $150 to $7,000 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P2002?
The most common causes are: cracked or melted DPF (often after an uncontrolled regen); faulty DPF pressure sensor or hose; leak in the exhaust before the sensor ports.