P2002: Diesel Particulate Filter (DPF) Efficiency Below Threshold (Bank 1)
Differential pressure sensor across the DPF detects abnormal pressure drop or soot pass-through.
| Trouble Code (DTC) | P2002 |
|---|---|
| Official SAE Definition | Diesel Particulate Filter (DPF) Efficiency Below Threshold (Bank 1) |
| Vehicle Subsystem | powertrain |
| Driving Severity | MEDIUM |
Observable Symptoms
- DPF and Check Engine warning lights on
- Reduced engine power (limp mode)
Most Probable Root Causes
- Cracked silicon-carbide DPF substrate
- Split rubber hoses on DPF differential pressure sensor
- Failed DPF differential pressure sensor
Step-by-Step Diagnostic Procedure
- Inspect rubber hoses leading to the DPF differential pressure sensor for heat cracking
- Check soot/ash loading in live data and inspect tailpipe for black soot