What are the symptoms of P2002?

Common symptoms include: Reduced power / derate; Frequent regens; Exhaust-filter warning; Poor economy.

What causes a P2002 code?

The most common causes are: Loaded or cracked DPF; DPF pressure sensor fault; Failed/incomplete regens; Upstream cause making excess soot (injector, EGR, boost leak).

How do you fix P2002?

Check DPF differential pressure and soot load; Verify the pressure sensor; Fix the soot source, then clean or replace the DPF. Take this seriously. It can trigger a power derate or lead to damage if you keep driving — get it diagnosed promptly.

OBD-II Code Lookup

P2002Serious

Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

Emissions system

The DPF isn't trapping/processing soot within spec. Often a loaded or damaged filter, or a pressure sensor misreading — and frequently a symptom of an upstream soot problem.

Take this seriously. It can trigger a power derate or lead to damage if you keep driving — get it diagnosed promptly.

Common symptoms

Reduced power / derate
Frequent regens
Exhaust-filter warning
Poor economy

Common causes

Loaded or cracked DPF
DPF pressure sensor fault
Failed/incomplete regens
Upstream cause making excess soot (injector, EGR, boost leak)

How it's diagnosed & fixed

Check DPF differential pressure and soot load
Verify the pressure sensor
Fix the soot source, then clean or replace the DPF

Got P2002? Get it diagnosed.

A real technician can interpret P2002 in the context of your truck and symptoms — and tell you what's actually wrong before you buy parts.

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Related Emissions codes

P0401EGR Flow Insufficient Detected P0402EGR Flow Excessive Detected P0404EGR Control Circuit Range/Performance P0420Catalyst System Efficiency Below Threshold (Bank 1)

Reference only. A trouble code names a symptom, not the failed part — always confirm with a live diagnosis before repairs. See our Knowledge Base for deeper guides.