P2AB0 — Particulate Matter Sensor Processor Performance
The ECM detects a processing performance fault inside the particulate matter (PM) sensor module. Internal self-tests fail or computed soot mass is implausible.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Pm sensor
- Pm sensor module
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Internal PM sensor module fault
- Module firmware corruption after voltage drop
- Module software outdated, reflash may resolve
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.