P244C – Exhaust Gas Temperature Too Low for Diesel Particulate Filter Regeneration, Bank 1

P244C Possible Causes

  • Fuel system concerns
  • Turbocharger system concerns
  • Exhaust leaks
  • Oxidation catalytic converter (OC)
  • Aftermarket exhaust accessories or performance modifications

How to Fix Code P244C

Check the “Possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P244C

Symptoms

Possible

Check engine light illuminated (or service engine soon warning light)

P244C Meaning

The powertrain control module (PCM) monitors conditions necessary for diesel particulate filter regeneration. The test fails when the diesel particulate filter regeneration level is below 10% of the target reduction after 13 minutes of active regeneration.

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.

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.

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.

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.

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.

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.

P244E – Exhaust Temperature Too Low for Diesel Particulate Filter Regeneration, Bank 2

P244E Possible Causes

  • Fuel system concerns
  • Turbocharger system concerns
  • Exhaust leaks
  • Oxidation catalytic converter (OC)
  • Aftermarket exhaust accessories or performance modifications

How to Fix Code P244E

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P244E

Symptoms

Possible

Check engine light illuminated (or service engine soon warning light)

P244E Meaning

The powertrain control module (PCM) monitors conditions necessary for diesel particulate filter regeneration. The test fails when the diesel particulate filter regeneration level is below 10% of the target reduction after 13 minutes of active regeneration.

P244F – Exhaust Gas Temperature Too High for Diesel Particulate Filter Regeneration, Bank 2

P244F Possible Causes

  • Faulty diesel particulate filter
  • Fuel system concerns
  • Customer driving habits
  • Exhaust restriction

How to Fix Code P244F

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P244F

Symptoms

Possible

Check Engine Light illuminated (or Service Engine Soon warning light)

P244F Meaning

The Powertrain Control Module (PCM) monitors conditions necessary for diesel particulate filter regeneration. During vehicle operation, if the diesel particulate filter temperature exceeds a calibrated limit, the PCM records how long the temperature remains above the limit. The test fails when the temperature before or after the diesel particulate filter exceeds the calibrated limit for more than 120 minutes during the filter’s lifetime.

P2450 – Evaporative emission system switching valve performance / stuck open

P2450 Possible Causes

  • Faulty Evaporative Emission System Switching Valve
  • Evaporative Emission System Switching Valve Circuit Open or Shorted
  • Poor Electrical Connection in Evaporative Emission System Switching Valve Circuit
  • Faulty Engine Control Module (ECM)

How to Fix Code P2450

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2450 Symptoms

Possible

Illuminated Engine Light (or Service Engine Soon Warning Light)

P2450 Meaning

This error code is stored in the engine control module when there is a malfunction in the evaporative emission control circuit. The EVAP system allows the fuel tank to be purged in a controlled manner without releasing harmful gas emissions into the atmosphere. This is achieved by periodically allowing hydrocarbon emissions from the fuel tank into the intake manifold to enter the combustion process. The engine control module monitors the circuit’s integrity by observing the inductive spike generated when the solenoid valve is deactivated. This is due to the collapse of the magnetic field causing a back EMF (electromotive force). A solenoid typically has a resistance of 15 Ohms. The solenoid valve will be actuated by a pulse width modulated signal from the engine control module. The solenoid may be powered by a constant supply at system voltage or have a constant ground.

The system may not purge the carbon canister during idle conditions. The vehicle may need to be driven for the system to operate; an actuator test can be used to operate the solenoid valve with a scan tool.

Due to the presence of harmful hydrocarbons in the system, manufacturers must closely monitor the system in certain markets. This is achieved by adding specific hardware to measure system pressure and gas flow. The engine control module can monitor the system for leaks (both large and small) and for excessive or insufficient flow. This allows the technician to access more information related to the failure and provides a better chance for accurate diagnosis.

P2451 – Evaporative Emission System Switching Valve Stuck Closed

P2451 Possible Causes

  • Faulty evaporative emission system switching valve
  • Evaporative emission system switching valve circuit open or shorted
  • Poor electrical connection in evaporative emission system switching valve circuit

How to Fix Code P2451

Check the “Possible Causes” listed above. Visually inspect related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2451 Symptoms

Possible symptoms

Illuminated engine light (or service engine soon warning light)

P2451 Meaning

The engine control module monitors the evaporative emission system switching valve. The OBDII code is set when the evaporative emission system switching valve is outside factory specifications.

P2452 – Diesel Particulate Filter Pressure Sensor A Circuit

Symptoms

and severity

The storage conditions of this code can cause internal damage to the engine or fuel system and must be addressed
immediately.

Symptoms of a P2452 code may include:

  • Excessive black smoke from the exhaust
  • Decreased engine performance
  • Higher engine temperatures
  • Higher transmission temperatures

Causes

Causes

potential for setting this code are as follows:

  • The diesel exhaust fluid tank is empty
  • Incorrect diesel exhaust fluid
  • Faulty DPF pressure sensor
  • Clogged DPF pressure sensor tubes/pipes
  • Open or shorted circuit(s) in the DPF pressure sensor A circuit
  • Ineffective DPF regeneration
  • Malfunctioning active DPF regeneration system

Diagnostic and Repair Procedures

A good starting point is always to check the technical service bulletins (TSB) for your specific vehicle. Your issue may be a known problem with a published fix from the manufacturer and can save you time and money during diagnosis.

A diagnostic scanner, a digital volt/ohmmeter, and the manufacturer’s service manual will be needed to diagnose a P2452 code. An infrared thermometer may also be useful.

I typically start my diagnosis with a visual inspection of the related wiring harnesses and connectors. I would pay close attention to wiring routed near hot exhaust components and sharp edges. Test the battery and battery terminals at this time and check the alternator output.

Next, I would connect the scanner and retrieve all stored codes and freeze frame data. I would write it down for future reference. This can be helpful if this code proves to be intermittent. Now, clear the codes and test drive the vehicle.

If the code resets immediately, check that the diesel exhaust fluid is present (if applicable) and is the correct type. The most common cause for storing this code is a lack of diesel exhaust fluid. Without the proper type of diesel exhaust fluid, the DPF will not regenerate effectively, causing a potential increase in exhaust pressure.

Consult the manufacturer’s service manual for how to test the DPF pressure sensor using the DVOM. If the sensor does not meet the manufacturer’s resistance specifications, it must be replaced. If the sensor appears good, check for obstructions and/or breaks in the DPF pressure sensor supply pipes. Clean or replace the pipes as needed. High-temperature silicone hoses should be used.

If the sensor is operational and the supply lines are intact, begin testing the system circuits. Disconnect all related control modules before testing resistance and/or continuity with the DVOM. Repair or replace any open or shorted circuits as needed.

Additional diagnostic notes:

  • If the DPF pressure sensor hoses are melted or cracked, they may need to be rerouted after replacement
    Consult the owner/service manual to see if your vehicle is equipped with an active DPF regeneration system or a passive system
    Clogged sensor ports and clogged sensor tubes are common…

P2453 Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance

P2453 Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance

Symptoms and Severity

This code should be considered urgent, as it indicates conditions that could lead to internal engine or fuel system damage. Symptoms of a P2453 code may include:

  • Decreased engine performance
  • Excessive black smoke from exhaust
  • Increased engine temperatures
  • Higher than normal transmission temperatures

The potential causes for setting this code are as follows:

  • Clogged DPF pressure sensor tubes/pipes
  • Faulty DPF pressure sensor
  • Diesel exhaust fluid tank may be empty
  • Poor quality diesel exhaust fluid
  • Open or shorted circuit(s) in DPF pressure sensor A circuit
  • Ineffective DPF regeneration
  • Active DPF regeneration system inoperative

Diagnostic and Repair Procedures

A good starting point is always to check technical service bulletins (TSB) for your specific vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money during diagnosis.

A manufacturer service manual, diagnostic scanner, and digital volt/ohmmeter will be essential for diagnosing a P2453 code. An infrared thermometer may also be helpful.

I would begin my diagnosis with a visual inspection of related wiring harnesses and connectors; paying close attention to wiring routed near hot exhaust components and/or sharp edges. Test alternator output, check battery and battery terminal ends at this time.

I would continue by connecting the scanner and retrieving all stored codes and freeze frame data. Be sure to note this information for future reference. Clear the codes and test drive the vehicle.

Verify that diesel exhaust fluid is present (if applicable) and is the correct type, especially if the code resets immediately. Lack of diesel exhaust fluid is probably the most common cause for storing this code. The DPF will not regenerate effectively without the proper type of diesel exhaust fluid. Poor DPF regeneration will result in increased exhaust pressure.

Test the Sensor

Using the DVOM, test the DPF pressure sensor. Consult the manufacturer’s service manual for instructions. The sensor should be replaced if it doesn’t meet manufacturer resistance specifications.

Check for obstructions and/or breaks in the DPF pressure sensor supply pipes, if the sensor checks out. Clean or replace pipes as needed (high-temperature silicone pipes should be used).

If the supply lines are intact and the sensor is operational, begin testing the system circuits. Disconnect all associated controllers before testing resistance and/or continuity with the DVOM. Repair or replace open or shorted circuits as necessary.

Additional Diagnostic Notes:

Clogged sensor ports and clogged sensor tubes are common
Consult owner/service manual to determine if your vehicle is equipped with an active DPF regeneration system or a passive system
If DPF pressure sensor hoses are melted or cracked, they may need to be rerouted after replacement

P2454 – Diesel Particulate Filter Pressure Sensor – Circuit A Low

Symptoms and Severity

Conditions that may lead to the storage of this code should be considered urgent as they can damage the internal engine or fuel system. Symptoms of a P2454 code may include:

  1. Increased engine temperatures
  2. Transmission temperatures higher than normal
  3. Decreased engine performance
  4. Excessive black smoke from the exhaust

The potential causes for setting this code are as follows:

  • Exhaust leaks
  • Clogged DPF pressure sensor tubes/pipes
  • Open or shorted circuit(s) in the DPF pressure sensor A circuit
  • Faulty DPF pressure sensor

Diagnostic and Repair Procedures

A good starting point is always to check the technical service bulletins (TSBs) for your specific vehicle. Your issue might be a known problem with a published fix from the manufacturer, which can save you time and money during diagnosis.

A digital volt/ohmmeter, a manufacturer’s service manual, and a diagnostic scanner will be needed to diagnose a P2454 code.

Begin your diagnosis with a visual inspection of the related wiring harnesses and connectors. Carefully inspect wiring routed near hot exhaust components and/or sharp edges. Test the alternator output, battery voltage, and battery terminal ends at this time.

You can continue by connecting the scanner and retrieving all stored codes and freeze frame data. Be sure to note this information for future reference. Now, clear all recorded codes and test the vehicle. Using the DVOM, test the DPF pressure sensor. Refer to the manufacturer’s maintenance manual for instructions. The sensor should be replaced if it does not meet the manufacturer’s resistance specifications.

The DPF pressure sensor supply hoses should be checked for obstructions and/or damage if the sensor checks out. Replace hoses as needed (high-temperature silicone hoses are recommended).

You can begin testing the system circuits if the supply lines are intact and the sensor is operational. Before testing circuit resistance and/or continuity (with the DVOM), disconnect all related controllers. Open or shorted circuits should be repaired or replaced.

Additional Diagnostic Notes:

  • Repair exhaust leaks before attempting to diagnose this code
  • Clogged sensor ports and blocked sensor tubes are common
  • DPF pressure sensor hoses that have melted or been cut may need to be rerouted after replacement

P2455 Diesel Particulate Filter Pressure Sensor A, High Circuit

Symptoms and Severity

Conditions that could lead to this code may also cause internal damage to the engine or fuel system and should be considered urgent. Symptoms of a P2455 code may include:

  • Excessive black smoke from the exhaust
  • Increased engine temperatures
  • Transmission temperatures higher than normal
  • Decreased engine performance

Potential causes for setting this code are:

  • Exhaust leaks
  • Clogged DPF pressure sensor tubes/pipes
  • Open or shorted circuit(s) in the DPF pressure sensor A circuit
  • Faulty DPF pressure sensor
  • Diesel exhaust fluid tank may be empty
  • Poor quality diesel exhaust fluid
  • Ineffective DPF regeneration
  • Active DPF regeneration system inoperative

Diagnostic and Repair Procedures

A good starting point is always to check the technical service bulletins (TSB) for your specific vehicle. Your issue might be a known problem with a published manufacturer fix that could save you time and money during diagnosis.

To diagnose a P2455 code, you will need a digital volt/ohmmeter, manufacturer service manual, and diagnostic scanner.

I recommend beginning your diagnosis with a visual inspection of related wiring harnesses and connectors. Inspect wiring routed near hot exhaust components and/or sharp edges. Be sure to check alternator output, battery voltage, and battery terminal ends at this time.

Continue by connecting the scanner and retrieving all stored codes and freeze frame data. Remember to note this information for future reference, then clear all stored codes.

Use the DVOM and follow manufacturer recommendations to test the DPF pressure sensor. Consult the service manual for specific instructions. Any sensor that doesn’t meet manufacturer resistance specifications should be replaced.

DPF pressure sensor supply hoses should be checked for obstructions and/or damage if the sensor checks out. Replace burned, cracked, or collapsed hoses (high-temperature silicone hoses are recommended).

If the sensor supply lines are intact and the sensor is operational, you can begin testing system circuits. To avoid damaging the PCM, disconnect all related controllers before testing resistance and/or continuity with the DVOM.

Additional Diagnostic Notes:

  • Check DPF regeneration fluid before attempting to diagnose this code
  • Clogged sensor ports and blocked sensor tubes are common when this code is stored
  • DPF pressure sensor hoses that have melted or been cut may need rerouting after replacement