P2B9B — Vehicle Conditions Incorrect for Particulate Matter Sensor Regeneration
The ECM detects that the vehicle is not operating in conditions suitable for the periodic PM sensor regeneration cycle. The sensor element cannot be cleaned and soot-mass measurement is paused.
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
- Exhaust system
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Driving cycle too short for regen conditions
- Sustained low-load operation
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.