P244D – Exhaust Gas Temperature Too High for Diesel Particulate Filter Regeneration, Bank 1

The P244D code refers to a problem related to the diesel particulate filter (DPF) regeneration in a vehicle equipped with a diesel engine. More specifically, it indicates that the DPF temperature is too high for too long, which prevents normal filter regeneration.

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Explanation of the P244D code:

The Powertrain Control Module (PCM) continuously monitors the temperature of the diesel particulate filter to ensure that the filter regeneration occurs correctly. DPF regeneration is a process where the soot particles that accumulate in it are burned at high temperature to maintain the filter’s efficiency.

However, if the DPF temperature remains too high for more than 120 minutes (beyond the calibrated limit), the PCM records this issue as a P244D code. This may indicate a malfunction in the regeneration system or a problem with the DPF itself.

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Possible causes of the P244D code:

1. Faulty diesel particulate filter:

   • A clogged or damaged DPF can cause excessive temperature, which prevents complete or proper regeneration.

2. Issues with the fuel system:

   • If the fuel is of poor quality or if faulty injectors are present, this can affect combustion and DPF regeneration.

3. Driver’s driving habits:

   • Short trips or low-speed driving, which do not allow sufficient temperature rise to properly activate DPF regeneration, can lead to excessive soot buildup and regeneration failure.

4. Exhaust restriction:

   • Restrictions in the exhaust system, such as clogged catalysts or exhaust pipes, can cause excessive temperatures in the DPF.

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Symptoms associated with the P244D code:

• The check engine light illuminates on the dashboard.

• Issues with DPF regeneration, which may result in power loss or poor engine performance.

• In some cases, fuel consumption may increase if DPF regeneration is disrupted.

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Repair steps for the P244D code:

1. Check the diesel particulate filter (DPF):

   • Inspect the DPF for any obstruction, crack, or damage. If the DPF is clogged, it may need to be cleaned or replaced.

2. Check the exhaust system:

   • Look for any restriction in the exhaust system, such as a clogged catalyst, blocked or damaged exhaust pipes. Repair or replace faulty components.

3. Check the fuel system:

   • Ensure that the fuel used is of good quality. Also check that the fuel injectors are functioning properly, as faulty injectors can lead to poor combustion and affect DPF regeneration.

4. Analyze driving habits:

   • Encourage longer or better-quality trips to allow complete DPF regeneration. Low-speed or short-distance driving often prevents full regeneration.

5. Check the DPF temperature sensors:

   • Inspect the temperature sensors before and after the DPF to verify their proper operation. If these sensors are faulty, they may give incorrect readings and prevent DPF regeneration.

6. Reset diagnostic codes:

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

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Recommended repair:

If the DPF is clogged or damaged, it may need to be replaced. If the problem is related to a clogged exhaust system or injector issues, repair or replace the faulty components. Ensure the vehicle is used under conditions that allow adequate DPF regeneration, avoiding trips that are too short or at low speed.