P2002Emissions / Exhaust

Diesel Particulate Filter Efficiency Below Threshold Bank 1

P2002 means the diesel particulate filter (DPF) on Bank 1 is not filtering soot efficiently or is not regenerating correctly. Common causes are a clogged or damaged DPF, a failed regeneration cycle, or a pressure or temperature sensor fault.

🚗 Yes, but a clogged DPF can put the vehicle in limp mode; service it soon.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Clogged or ash-loaded DPF$300-$3000

40%

Excess soot or ash blocks the filter and lowers efficiency.

#2Failed or incomplete regeneration$100-$800

30%

Short trips or a sensor fault prevent the filter from burning off soot.

#3Faulty DPF pressure or temperature sensor$100-$400

20%

Bad sensor data leads to a false efficiency reading.

#4Exhaust leak affecting pressure readings$100-$500

10%

Leaks skew the differential pressure measurement.

🩺 Common Symptoms

Check engine light on
Reduced power or limp mode
Possible increased fuel use
Frequent or failed regeneration attempts

💰 Repair Cost: DIY vs Shop

DIY Cost

$100-$1000

Shop Cost

$300-$3500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2002

1Scan for related DPF and regeneration codes

2Check DPF differential pressure and temperature sensor data

3Attempt a forced regeneration with a capable scan tool

4Inspect the exhaust for leaks and the DPF for damage

❓ Frequently Asked Questions

Can I drive with a P2002 code?

Short-term yes, but a clogged DPF can trigger limp mode. Address it soon to avoid a costly filter replacement.

How much does it cost to fix P2002?

A forced regen or sensor may be a few hundred dollars, but a new DPF can cost several thousand at a shop.

What is the most common cause of P2002?

A clogged or ash-loaded DPF, often from too many short trips, is the most common cause.

🔗 Related Codes

P2003P2000P2463P242FP0420