What Does P2002 Mean?
The diesel particulate filter (DPF) on Bank 1 is not trapping soot efficiently or is clogged beyond effective regeneration. This indicates the filter has reached excessive restriction or has failed structurally.
Common Causes
45%
Clogged DPF from excessive soot accumulation due to incomplete regeneration cycles
25%
Faulty differential pressure sensor providing incorrect DPF restriction readings
15%
Failed or damaged DPF substrate from oil contamination or thermal shock
10%
Incomplete regeneration due to faulty fuel injector dosing or exhaust temperature issues
5%
Exhaust leaks affecting pressure readings or regeneration temperature
Diagnostic Steps
1
Step 1: Check DPF differential pressure sensor reading at idle and compare to specifications
2
Step 2: Review DPF regeneration history and soot load percentage in scan tool data
3
Step 3: Inspect DPF pressure sensor hoses for blockage, damage, or carbon buildup
4
Step 4: Monitor exhaust temperature sensors during attempted regeneration cycle
5
Step 5: If pressure is excessive, attempt forced regeneration or evaluate DPF for replacement if regeneration fails
Estimated Repair Cost
$200 - $4,500
Parts + labor, varies by vehicle and location
The diesel particulate filter (DPF) on Bank 1 is not trapping soot efficiently or is clogged beyond effective regeneration. This indicates the filter has reached excessive restriction or has failed structurally.
The most common cause of P2002 (Diesel Particulate Filter Efficiency Below Threshold Bank 1) is: Clogged DPF from excessive soot accumulation due to incomplete regeneration cycles
Typical repair costs for P2002 range from $200 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will experience reduced power and fuel economy. Continued operation without repair may cause complete blockage leading to engine damage or stalling. May enter limp mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2002 to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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