P2AB0Particulate Matter Sensor Processor Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light on
- Particulate filter monitoring cannot complete
- Driving behaviour usually unchanged
- Likely causes
- LikelyInternal fault in the PM sensor control unit (sensor and control unit usually replaced as one part)
- PossibleCAN wiring fault that older sensor versions also report as P2AB0
- RareUnstable supply or ground at the sensor control unit
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.