The P244A: Diesel Particulate Filter Differential Pressure Too Low Bank 1 code indicates that the differential pressure across the diesel particulate filter (DPF) in Bank 1 is lower than expected. This could signal a problem with the differential pressure sensor, a blockage in the exhaust system, or a potential leak that affects the DPF’s function.
P244A – Quick Overview
Code | Information |
---|---|
Meaning | P244A: Diesel Particulate Filter Differential Pressure Too Low Bank 1 |
Is it serious? | Moderate – low differential pressure may indicate an ineffective particulate filter, resulting in reduced filtering efficiency and higher emissions. |
Possible causes | – Differential pressure in the diesel particulate filter is too low for Bank 1 – Faulty pressure sensor – Blockages or leaks in the exhaust system |
How to diagnose? | – Inspect and test the diesel particulate filter pressure sensor for Bank 1 – Check for blockages or leaks in the exhaust system – Replace faulty sensor if needed |
P244A Meaning
The P244A: Diesel Particulate Filter Differential Pressure Too Low Bank 1 code means that the sensor is reading an unusually low pressure differential across the diesel particulate filter. This can indicate an issue with the sensor itself, a leak in the exhaust system before or after the DPF, or an obstruction that reduces the expected pressure differential. Proper differential pressure is essential for the DPF to function correctly and remove particulate matter from the exhaust effectively.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if there are any additional related fault codes. These may help diagnose a wider issue involving the exhaust system. | OBD-II Scanner |
Inspect the DPF Pressure Sensor | Visually inspect the diesel particulate filter pressure sensor for Bank 1. Look for any signs of physical damage, wear, or corrosion. | Flashlight, Safety Gloves |
Test the Pressure Sensor | Use a diagnostic tool to test the output from the pressure sensor. Verify that the readings match the manufacturer’s specifications for proper operation. | Multimeter, Diagnostic Tool |
Check for Blockages | Inspect the exhaust system, especially the DPF, for any blockages or excessive soot build-up that could affect pressure readings. Clean out any obstructions as needed. | Flashlight, Air Compressor, Cleaning Tools |
Inspect for Leaks in the Exhaust System | Check for leaks in the exhaust system, particularly near the pressure sensor, that could reduce pressure differential. Look for cracks or loose connections. | Smoke Machine or Leak Detector, Flashlight |
Repair or Replace Components | If any issues are found, repair or replace faulty components. Replace the pressure sensor if it is found to be defective. | Replacement Sensor, Wrench Set, Cleaning Tools |
Clear the Code and Test Drive | Use an OBD-II scanner to clear the P244A code. Take the vehicle for a test drive to ensure that the differential pressure reads correctly and that the code does not reappear. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to confirm that the P244A code has not returned. If the code persists, further diagnostics may be needed to identify the root cause. | OBD-II Scanner |

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