Powertrain, generic (extended)

P2AB0 Particulate Matter Sensor Processor Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2AB0 concerns the electronics of the particulate matter sensor rather than its sensing element: the sensor control unit, which feeds the electrodes, measures their current and reports over CAN, finds an internal error in its own measuring path. GM's 2025 diesel tables (25OBDG04A and B) describe it as an internal fault of the current switcher: the electrode current read in the small range must lie between a minimum and a maximum, tested while the sensor is regenerating, with its bus relay on and no CAN or electrical faults present; Type B, two trips. Bulletin KC-2080 for Mack and Volvo trucks adds that on PM sensors built before the end of 2017, P2AB0 logged together with U0080 points to a CAN fault rather than the sensor itself. Lost communication is U02A3.

Likely causes

Internal fault in the PM sensor control unit (sensor and control unit usually replaced as one part)
CAN wiring fault that older sensor versions also report as P2AB0
Unstable supply or ground at the sensor control unit

Symptoms

  • Check engine light on
  • Particulate filter monitoring cannot complete
  • Driving behaviour usually unchanged

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–900
Time0.5–2.5 h

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

Parts involved

particulate matter sensor

Related codes

P24AEP24AFU02A3U0080P24D1

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.