P244B - DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE TOO HIGH BANK 1

The Diesel Particulate Filter (DPF) is generally designed with a steel housing, and is used on diesel engine vehicles to clean exhaust emissions. When the number of soot particles in the DPF increases, the exhaust pressure will increase accordingly as indicated by the PCM and the Diesel Particulate Filter Sensor. In this case, the regeneration process in the filter elements is initiated. Once regeneration is initiated in the DPF, pressures will drop to the programmed levels.

If the Powertrain Control Module detects a DPF pressure condition above the allowable parameters, the DTC P244B OBD2 code will be set and the Check Engine light will illuminate on the vehicle’s dashboard.

• MIL light illuminated.
• Low engine performance.
• High fuel consumption.
• Excessive tailpipe emissions.

The reasons why the P244B OBDII diagnostic code is set are:

• Diesel Particulate Filter Sensor wires or connectors may be defective.
• The Diesel Exhaust Fluid may not be adequate.
• The DPF Sensor hoses or tubes may be clogged.
• The Diesel Particulate Filter Sensor could be faulty.

Follow these recommendations to troubleshoot the P244B OBD2 fault code:

• Consult the Technical Service Bulletins (TSB) related to the year and make of the vehicle.
• Verify that the cables and connectors of the DPF Sensor circuit are in good condition. If you find deficiencies such as wear or burns that alter the voltage levels in the circuit, you should repair as required.
• Check that the Diesel Exhaust Fluid meets the vehicle manufacturer's requirements for filter regeneration. If you determine that it is not appropriate, you should make any necessary corrections.
• Using a digital volt-ohm meter, check the resistance of the Diesel Particulate Filter Sensor and verify that the reading is as recommended by the manufacturer. If the reading shows values that are not the required values, proceed to check the electrical connections. If there is no damage to the electrical connections, suspect a bad sensor, which should be replaced.