P244B

Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.

Code P244B indicates that the differential pressure across the Diesel Particulate Filter has exceeded its upper threshold limit. This sensor reading suggests a restriction within the filter media or an issue with downstream exhaust flow, preventing normal regeneration cycles from completing effectively. While this often points to accumulated soot requiring cleaning or replacement of the DPF assembly, it can also stem from upstream conditions like excessive backpressure in the turbocharger system or leaks after the catalytic converter that skew sensor data. Mechanics should verify the integrity of the entire exhaust train and ensure no external obstructions exist before concluding the filter itself is failed. Always cross-reference specific manufacturer service information for precise regeneration protocols, as generic interpretations may overlook model-specific calibration differences affecting pressure thresholds.