What is a DPF?

Diesel particulate filters (DPFs) are an after-treatment device found in most diesel-powered vehicles, including trucks, semi-trucks, and construction equipment. As exhaust gases pass through the filter, particulate matter, such as soot, is trapped and periodically burned off through a process called regeneration. While this system is designed to function automatically, outside factors—like driving conditions and weather—can interfere with its efficiency.

If you have been wondering, “Can weather affect DPFs in a car?” the answer is yes. Weather can significantly impact DPF fuel consumption and lead to performance issues. In this blog, we’ll discuss the weather conditions affecting DPFs and provide preventive measures to keep your vehicle running smoothly.

Cold Weather

Cold weather is the most damaging weather condition for diesel vehicles for these reasons:

• Reduced Passive Regeneration: Cold weather may prevent a diesel vehicle from reaching the necessary temperature for passive regeneration, leading to more soot buildup and potential clogging.
• Frozen DEF Fluid (for SCR-equipped vehicles): Many diesel vehicles are equipped with Selective Catalytic Reduction (SCR) technology and use diesel exhaust fluid (DEF) to reduce NOx emissions. DEF is about 32% water and can freeze in low temperatures. The frozen liquid will expand and can damage the tank.
• Increased DPF Fuel Consumption: Cold temperatures cause the engine to use more fuel to power the vehicle, particularly during shorter drives. This results in more soot production, which can accelerate the clogging of a DPF, especially when regeneration is not completed properly.

Preventative Measures:

• Drive longer distances when possible to allow the DPF to reach high enough temperatures for passive regeneration. Owners can also manually perform periodic active regenerations to completely clear the DPF of soot.
• Schedule professional DPF cleaning to remove ash buildup that passive regeneration cannot eliminate.
• Avoid excessive idling, as it contributes to incomplete combustion and soot accumulation.
• Park in a garage or use an engine block heater to prevent DEF from freezing and improve combustion efficiency.

Warm Weather

Warm weather can cause DPFs to overheat and lead to the following issues:

• Overheating: In very hot climates, extreme heat can make DPF vehicles prone to overheating, damaging the emission system and engine.
• Regeneration Challenges: A DPF requires high temperatures to regenerate properly, but this process can only be completed when the vehicle is traveling at high speeds for prolonged periods. In hot weather, vehicles in stop-and-go traffic or those traveling only short distances will not be able to regenerate, causing soot to build up at a much higher rate.
• Thermal Damage: Some components of DPFs are not designed to withstand the same high temperatures needed for passive regeneration. When a vehicle is close to overheating and the DPF is at a high temperature for regeneration, thermal components can sustain damage.

Humidity & Wet Conditions

Humid, foggy, and rainy weather conditions add excess moisture to your vehicle and lead to the following DPF issues:

• Regeneration Disruption: Moisture buildup can lower the temperature of the exhaust system, making it difficult for the engine to reach the required temperatures to initiate the regeneration process.
• Component Wear: Excess moisture and condensation can lead to corrosion and rust in the DPF and the overall exhaust system, particularly if it is not properly maintained. Corrosion and rust can result in costly repairs or replacements.

Preventative Measures:

• Regularly inspect the exhaust system for moisture buildup or rust.
• Avoid parking in excessively damp environments for long periods.
• Check DPF sensors periodically to ensure they function properly, as moisture can interfere with readings.
• Consider professional cleaning if you experience performance issues.

Keep Your DPF Running Smoothly in Any Weather with DPF Alternatives

At DPF Alternatives in York, Hanover & Chambersberg, PA, we encourage diesel vehicle owners to take proactive steps in maintaining their DPFs. Consider professional ultrasonic DPF cleanings to keep your vehicle running smoothly. Contact DPF Alternatives for more information!