Code Definition

P244B — Diesel Particulate Filter Differential Pressure Too High Bank 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P244B

P244B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P244B is stored, the module has detected a signal or supply voltage higher than the expected operating range; and a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P244B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This code applies to diesel vehicles fitted with a Diesel Particulate Filter (DPF) and an exhaust differential pressure sensor. The ECM compares pressure upstream and downstream of the filter to calculate soot loading, and sets P244B when the measured pressure drop across the DPF exceeds the maximum allowable value for the exhaust flow rate the engine is currently producing. More often than not it is a genuine report of a heavily loaded or partially blocked filter rather than a sensor fault, and it commonly follows a run of aborted or incomplete regeneration cycles. TaT members are hitting it ...

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