P2002Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2002 means the particulate filter on bank 1 lets too much soot through, typically because the substrate is cracked, partly melted, emptied or bypassed. CARB requires diesel OBD to flag a filter whose filtering performance lets PM emissions exceed the limit. Older systems judge this from the pressure drop: GM's 2009 Duramax compares the flow resistance shortly after a regeneration (within 600 s or 18.6 miles, soot load at most 40 g) with a table and aims at a filter leaking eight times the standard. Newer systems use a resistive PM sensor behind the filter: on the 2014 Cruze 2.0 diesel, GM's 2018 diesel group and Ford's 2023 diesels the code sets when the sensor current exceeds 12 µA before the modelled amount of soot needed to trigger an intact sensor has passed. Ford names cracked substrates on Transit 3.2, F-150 3.0 and Super Duty 6.7 and replaces the filter; GM states that a filter with P2002 cannot be cleaned by service regeneration. Regenerating does not cure it.
- What you may notice
- Malfunction indicator lamp on
- Usually no change in driveability
- Visible soot at the tailpipe in severe cases
- Likely causes
- LikelyFilter substrate cracked or melted, often after an uncontrolled regeneration
- PossibleFilter removed, emptied or bypassed
- PossibleFaulty differential pressure sensor or leaking sensor hoses on pressure-based systems
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.