Powertrain, generic (extended)

P2BA5 Particulate Filter Feedgas Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Some diesel particulate filters carry a precious-metal coating that, besides helping burn soot, oxidises NO to NO2 for the SCR catalyst further down. P2BA5 says this coated filter fails to supply enough NO2. CARB 13 CCR 1968.2 (f)(9.2.4)(B) demands the check for medium-duty diesels from 2016 and for passenger cars and light trucks from 2019, and lets the maker evaluate the filter alone or together with the oxidation catalyst. Cummins describes judging both by the heat they release after a fuel dose; FEV tests feed gas quality with the NOx sensors around the SCR. No maker documents P2BA5 publicly. Unlike P2002, which flags filtration loss, this code is about the coating; the driver sees the MIL and may later notice weaker passive regeneration.

Likely causes

Filter coating thermally aged, e.g. after very hot or uncontrolled regenerations
Ash or oil additives covering the catalytic layer
Weak upstream oxidation catalyst in a combined evaluation
Exhaust temperature or NOx sensor reading wrongly

Symptoms

  • Malfunction indicator lamp on
  • More frequent active regenerations
  • SCR efficiency codes may follow

Repair estimate

DifficultyHardWorkshop job
Parts and labour€500–4,000
Time1.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

particulate filterexhaust gas temp sensor pre dpfscr catalyst

Related codes

P2BA4P2002P20EEP24A2

References: law.cornell.edu, patents.google.com, patents.google.com.