P244A – Diesel Particulate Filter Differential Pressure Too Low, Bank 1

Code P244A refers to a problem with the diesel particulate filter (DPF) or your vehicle’s exhaust system, specifically concerning the presence and proper functioning of the post-treatment DPF.

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Explanation of Code P244A:

The engine control module (ECM) monitors the status of the diesel particulate filter (DPF) using the exhaust pressure sensor. This sensor measures the pressure difference before and after the DPF to ensure it is functioning correctly. If the ECM detects that the DPF is missing or not operating as expected, it records this code. This fault may be related to the physical absence of the DPF in the system or malfunctions in the pressure monitoring system.

Possible Causes of Code P244A:

1. Faulty Diesel Particulate Filter:

   • If the DPF is damaged or clogged, it can affect the regeneration process and trigger this code.

2. Exhaust Leak Near the DPF Pressure Sensor:

   • A leak in the exhaust system, especially near the pressure sensor, can cause incorrect pressure readings and trigger this code.

3. Leaks in the DPF Pressure Sensor Connecting Hose:

   • If leaks occur in the hose connecting the pressure sensor, it can distort measurements and cause a fault.

4. Aftermarket Parts and Performance Modifications:

   • If non-compliant replacement parts have been installed or the vehicle has undergone modifications affecting the exhaust after-treatment system, this can trigger this code.

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Symptoms Associated with Code P244A:

• Engine Light On (Check Engine Light).

• Possible loss of power or poor engine performance if the issue is related to a DPF malfunction.

• Active DPF regeneration may be disabled.

• Emission problems in the long term if the particulate filter is not properly regenerated.

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Repair Steps for Code P244A:

1. Check the Diesel Particulate Filter (DPF):

   • Inspect the DPF to check if it is clogged or damaged. If the filter is clogged, it may need to be cleaned or replaced.

2. Check the Exhaust System:

   • Look for any leaks in the exhaust system, especially around the pressure sensor. Ensure the system is intact and without cracks, and that the pressure sensor is properly installed.

3. Inspect the Pressure Sensor Connecting Hoses:

   • Check that the hoses connected to the DPF pressure sensor are not cracked, worn, or disconnected.

4. Check Vehicle Modifications:

   • If modifications have been made to the exhaust system or the DPF, ensure these modifications comply with the manufacturer’s specifications. Non-compliant parts can cause this type of fault.

5. Test the DPF Pressure Sensor:

   • Check the proper functioning of the exhaust pressure sensor. If the sensor is faulty, it may give false readings, triggering the P244A code. Replace the sensor if necessary.

6. Reset Diagnostic Codes:

   • After performing repairs, clear the error codes with an OBD scanner and check if the code reappears.

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Recommended Repair:

• If the DPF is faulty or clogged, cleaning or replacing the DPF may be necessary.

• If leaks are detected in the exhaust or connecting hoses, repair or replace the affected components.

• Also, ensure that all parts and modifications comply with the manufacturer’s specifications to avoid issues related to non-compliant accessories.