System: Powertrain (P-Code)
SAE Standard (Generic)
Family: DPF Efficiency Performance
Code P2002: Particulate Filter Efficiency Below Threshold Bank 1
Diagnostic & Technical Explanation
P2002 (Particulate Filter Efficiency Below Threshold Bank 1) sets when the differential-pressure or soot-model calculation shows the diesel particulate filter is passing more particulate matter than its efficiency threshold allows, or when an abnormal pressure-drop signature indicates a cracked or missing filter substrate. A substrate cracked or melted by an uncontrolled regeneration event, a swapped-in filter that lacks the correct catalytic coating, and a leaking or misrouted differential-pressure sensor hose are the most common causes.
First-listed procedure
Rank #1
Inspect DPF differential pressure sensor hoses for cracks or swapped routing
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: DPF Efficiency Performance
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)