P2002: Diesel Particulate Filter Efficiency Below Threshold Bank 1

A diesel particulate filter is a ceramic honeycomb that forces exhaust through porous walls so the soot stays behind. P2002 says that trap on bank 1 is no longer doing it: efficiency is below the threshold, which means soot is getting through. It does not say the filter is full. A full filter is a restriction, and that is P2463. A drive or a service regeneration burns soot out of a filter that is still trapping it. It does not seal a cracked filter on the charts that identify a crack. It is not a ban on every diesel.

The monitor is not the same on every diesel, so the chart comes before a hose or a regeneration. GM bulletin 16-NA-380 says P2002 sets when a working system detects a cracked or broken filter with the exhaust particulate sensor, once filtration has fallen past a calibrated threshold. A missing filter and blocked pressure lines are different codes. Do not judge filtration immediately after a regeneration. Ford GSB 23-7144, 17 October 2023, is the current guide. Its title is Diesel Particulate Filter (DPF) Quick Diagnostic Guide for all 1.5L and 2.0L EcoBlue engines, and the header says it supersedes 23-7006 because the service information was updated. Applicability on that header is all vehicles with a 1.5L or 2.0L EcoBlue, in all European markets. The copy read here is a Ford Tech Service dealer-portal print, fordtechservice.dealerconnection.com, printed 4 June 2024 with the header 2019 S-MAX Vignale (2016), and hosted at msc.club.tw. It was not opened on the live Ford portal. NHTSA's public bulletin index does not publish 23-7144, and tsbsearch does not list it. tsbsearch's SSM46405, dated 25 January 2023, matches the superseded 23-7006 summary. In the service-information section, under Diagnosing DPF issues for DTC P2002, a confirmed code with the lamp on means the filter has cracked and needs replacing. An unconfirmed code with the lamp off is not a reason to replace the filter. The bulletin's status-byte figure labels the first of the two digits in P2002-00-XX as 0 through 7 with the lamp off and 8 through F with the lamp on. Do not apply that status split to other Ford diesels. GSB 23-7006, 25 January 2023, read from the msc.club.tw copy, already covers those same European 1.5L and 2.0L EcoBlue engines. On a confirmed code with the lamp on it says to identify and correct any other powertrain DTCs before replacing the DPF, and to check for PCM calibration updates and apply if available. Its Other Diagnostic Tips say not to clear the data, that it is essential that all other engine DTCs are resolved rather than cleared, and that P2002 should always be the last repair, with all other upstream DTCs investigated and repaired first. GSB 23-7144 says to resolve upstream issues and DTCs first and not to clear any data. It says P2002 should always be the last repair and that all other upstream DTCs are investigated and resolved first, or the filter will likely fail again because it is operating outside its design criteria. On the confirmed, lamp-on branch it says to identify and correct any other powertrain DTCs before replacing the DPF. Resolving the other codes before replacement is not new in 23-7144. Differences in the 17 October 2023 text include the linked comprehensive guide, now GSB 23-7142 where 23-7006 linked 21-7070; a note on the unconfirmed branch that warranty claims without MIL-on DTCs in the IDS session file will be returned to dealers for further clarification; the absence of the sentence to check for PCM calibration updates and apply if available; the note worded Do NOT clear any data where 23-7006 says DO NOT CLEAR THE DATA; a last-repair sentence that says resolved where 23-7006 said repaired; and the fail-again clause sitting on that last-repair sentence. GSB 23-7142 was not read, so this page does not describe it. US TSB 20-2087, for the 2015–2019 Transit 3.2L, 2018–2020 F-150 3.0L, and 2017–2020 Super Duty 6.7L built on or after 13 May 2017, says a stored P2002 may be a cracked filter and, after other DTCs are corrected, replaces the filter. It does not use the unconfirmed, lamp-off branch. TSB 20-2272, 18 August 2020, supersedes 20-2087 for a parts update and keeps that procedure.

Volvo service program SP 284-042, January 2014 release 02, which replaces the October 2013 bulletin, covers VAH, VHD, and VN trucks with D11H, D13H, or D16H engines built from the start of OBD2013 production through May 10, 2013. It lists P2002, PM filter efficiency, among faults addressed by ECM and ACM software, then DPF service regeneration and SCR crystal sublimation. It does not specify filter replacement. The danger text says not to attempt the repair without sufficient training, the correct service literature, and the proper tools, and that failure to follow this could make the vehicle unsafe and lead to serious personal injury or death. Secure the vehicle on a level surface, apply the parking brake, chock the rear wheels, and place the transmission in neutral. Programming requires battery voltage above 10 volts, the parking brake applied, and the key on with the engine not running. Programming the modules loses the stored engine hours. After regeneration, idle until the high-exhaust-temperature light goes out, and start crystal sublimation within 2 minutes of returning to idle. After crystal sublimation, idle until the high-exhaust-temperature light goes out again. That second idle is step 20. Vehicles built May 11, 2013 through October 2, 2013 are referred to SP 284-047, which is not reproduced here.

Ash, short trips and a differential-pressure hose still matter on the charts that actually use them for this code. They are the wrong first move on 16-NA-380 and on GSB 23-7144. A scan tool that only shows P2002 is not permission to quote a filter, or to skip the procedure this vehicle uses, until the status byte and the sensor the chart names have been read.