P2002 Diesel particulate filter not trapping soot well enough (bank 1)

Diesel particulate filter efficiency below threshold, bank 1

Monitor

PartsAvatar says symptoms can be mild or absent, though performance can fall; it is an emissions fault.

It gets more serious if:

  • Inspect soon: Get it checked soon if power drops or black smoke appears.

Source: how we rate severity

P2002 in short

P2002 means the computer judges that the diesel particulate filter on bank 1 is not trapping soot as well as it should. A damaged filter, a faulty back pressure sensor, an exhaust leak or poor fuel are the listed causes. Symptoms can be minor, but reduced power or black smoke means get it checked.

TaT says the computer compares pressure and temperature readings at the filter inlet and outlet to judge its efficiency.

So the code can mean the filter is worn or damaged, or that sensor data misleads the computer.

PartsAvatar also lists exhaust leaks and low-quality diesel, and says some drivers notice nothing.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Damaged or worn particulate filter

    Common general cause
    Why it ranks here
    Both sources list the filter itself.
    What would change this
    Rises if the filter is damaged or readings show it is not trapping. Falls if the filter checks normal.

  2. Back pressure or differential pressure sensor

    Common general cause
    Why it ranks here
    PartsAvatar lists the back pressure sensor; TaT says faulty sensor data can mislead the computer.
    What would change this
    Rises if sensor readings disagree with expected. Falls if they match.

  3. Exhaust leak or poor fuel

    Possible — needs testing
    Why it ranks here
    PartsAvatar lists exhaust leakage and low-quality fuel.
    What would change this
    Rises if a leak is found or fuel was suspect. Falls if exhaust is sound.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all codes and freeze-frame data and note any other emissions codes.

    Low riskTool: scan tool

  2. Have a shop inspect wiring and check the back pressure sensor and filter readings while driving.

    Best left to a shopTool: scan tool with live data

    Warning:Exhaust parts stay very hot. Let a shop do it.

Symptoms

  • Check engine light
  • Reduced fuel economy
  • Black smoke or reduced power Gets more serious: stop and have it checked.
  • No symptoms at all

How to fix

On your vehicle

Ford

  • 2018 · Transit

    Supported by vehicle data

    Ford bulletin SSM 47199 names P2002. For some 2018 Transit and Super Duty diesels with P2002, the summary says the 2018 diagnostic manual test is out of date and points to the 2017 manual. Whether it is still current is not verified.

  • 2015 · F-250 Super Duty

    Supported by vehicle data

    Ford bulletin TSB18-2109 names P2002 (also listed for f-350). Some 2015 F-Super Duty with the 6.7L diesel set these codes. The summary says to reprogram the powertrain computer with current software. Whether it is still current is not verified.

  • SSM 47199Status unverified

    P2002 diagnosis information update (Transit, 6.7L and 3.2L diesel)

    2018transit · issued · NHTSA 10137111

    For some 2018 Transit and Super Duty diesels with P2002, the summary says the 2018 diagnostic manual test is out of date and points to the 2017 manual.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB18-2109Status unverified

    PCM reprogram for P012F, P207F, P2002, P20EE (6.7L Super Duty)

    2015f-250, f-350 · issued · NHTSA 10137120

    Some 2015 F-Super Duty with the 6.7L diesel set these codes. The summary says to reprogram the powertrain computer with current software.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Jeep

  • 2015 · Grand Cherokee

    Supported by vehicle data

    Jeep bulletin 18-022-15 REV-B names P2002. Reprogram the powertrain computer for a small number of 3.0L vehicles with the light on and one of several listed codes. P2002 matched in the full text; only the summary was read. Whether it is still current is not verified.

  • 18-022-15 REV-BStatus unverified

    3.0L powertrain reflash for several diagnostic codes (Grand Cherokee)

    2015grand-cherokee · issued · NHTSA 10148689

    Reprogram the powertrain computer for a small number of 3.0L vehicles with the light on and one of several listed codes. P2002 matched in the full text; only the summary was read.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Volkswagen

  • 2015 · Jetta

    Supported by vehicle data

    Volkswagen bulletin TT 26-19-03 names P2002 (also listed for passat, golf, beetle). Technical tip with diagnosis and repair direction for P0401 and P2002 on 2015 diesel models. The summary gives no further detail. Whether it is still current is not verified.

  • TT 26-19-03Status unverified

    Diagnosis and repair direction for P0401 / P2002

    2015jetta, passat, golf, beetle · issued · NHTSA 10168665

    Technical tip with diagnosis and repair direction for P0401 and P2002 on 2015 diesel models. The summary gives no further detail.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Land Rover

  • 2013–2018 · Range Rover Sport

    Supported by vehicle data

    Land-rover bulletin SSM73738 names P2002 (also listed for range-rover). Customers may see the check engine light and P2002 stored in the powertrain computer. The summary does not give the repair. Whether it is still current is not verified.

  • SSM73738Status unverified

    Check engine light with P2002 stored (Range Rover, Range Rover Sport)

    2013–2018range-rover-sport, range-rover · issued · NHTSA 10136673

    Customers may see the check engine light and P2002 stored in the powertrain computer. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P2459Diesel particulate filter cleaning cycles happen too often

    Same system Common general cause

    P2459 covers regeneration frequency in the same DPF system.

All Diesel emissions and glow plugs codes

P2002 questions

Can P2002 appear with no symptoms?

Yes. PartsAvatar says sometimes there are no visible symptoms.

Sources and review

  1. P2002 OBD error code summary — PartsAvatar
  2. P2002 fault code entry — The Automotive Technician (TaT) OBD-II code database
  3. Ford SSM 47199: P2002 diagnosis information update (Transit, 6.7L and 3.2L diesel) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
  4. Ford TSB18-2109: PCM reprogram for P012F, P207F, P2002, P20EE (6.7L Super Duty) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
  5. Jeep 18-022-15 REV-B: 3.0L powertrain reflash for several diagnostic codes (Grand Cherokee) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
  6. Volkswagen TT 26-19-03: Diagnosis and repair direction for P0401 / P2002 — Manufacturer service bulletin via NHTSA manufacturer communications flat file
  7. Land-rover SSM73738: Check engine light with P2002 stored (Range Rover, Range Rover Sport) — Manufacturer service bulletin via NHTSA manufacturer communications flat file
Last reviewed
Written by
Saurabh K.
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