Signs Your Truck's Aftertreatment System May Need Some TLC

Maintaining a fleet of heavy-duty trucks is no small feat, especially in the demanding environment of Dallas, TX. At Barnes Brothers Fleet Maintenance, we know that every part of your truck needs to be in tip-top shape to keep the wheels turning. One component that often gets overlooked until it’s too late is the aftertreatment system. This system plays a crucial role in reducing harmful emissions from diesel engines, but when it starts to malfunction, it can lead to costly repairs and significant downtime. Understanding the signs of an aftertreatment system needing maintenance can save you time, money, and headaches.

What is the Aftertreatment System?

The aftertreatment system in your diesel truck cleans up the exhaust gases before they leave the vehicle. It typically includes components such as the Diesel Particle Filter (DPF), Selective Catalytic Reduction (SCR) catalyst, Diesel Oxidation Catalyst (DOC), and Diesel Exhaust Fluid (DEF) system. These parts work together to reduce harmful emissions like nitrogen oxides (NOx) and particulate matter, helping your truck comply with environmental regulations.

Signs Your Aftertreatment System Might Need Some Work

1. Warning Lights on the Dashboard

The most obvious sign that something is wrong with your aftertreatment system is when warning lights start appearing on your dashboard. Modern trucks are equipped with sensors that monitor the performance of the aftertreatment components. If the system detects a problem, such as a clogged DPF or low DEF levels, it will trigger a warning light.

Ignoring these warnings can lead to more severe issues, such as engine derating or a complete shutdown. Suppose you see any warning lights related to the emissions system. In that case, it’s time to bring your truck to Barnes Brothers Fleet Maintenance for a thorough inspection and aftertreatment system maintenance in Dallas.

2. Reduced Engine Power

When the aftertreatment system is not functioning correctly, it can cause a noticeable drop in engine performance. This happens because the engine control module (ECM) may limit power to prevent damage to the engine and the aftertreatment components. You might notice that your truck struggles to accelerate, especially under load, or has lost some of its usual power.

If you experience reduced engine power, don’t ignore it. This could indicate that your DPF is clogged or that the SCR system is malfunctioning. Addressing these issues early can prevent a small problem from becoming a major repair.

3. Increased Fuel Consumption

Another sign that your truck’s aftertreatment system needs maintenance is an unexplained increase in fuel consumption. When the DPF or other components become clogged or malfunction, the engine has to work harder to push exhaust gases through the system. This increased effort results in higher fuel consumption.

If your fuel costs are climbing without an increase in load or mileage, it could be a sign that your aftertreatment system needs to be fixed. Scheduling a maintenance check can help identify the problem and get your fuel economy back on track.

4. Strange Smells or Smoke

A properly functioning aftertreatment system should eliminate most harmful emissions from your truck’s exhaust. However, if you start noticing strange smells, mainly the scent of unburnt diesel, or see excessive smoke from the exhaust, it could indicate something is wrong.

This could be due to a malfunctioning DOC, which is responsible for oxidizing harmful emissions, or a problem with the DEF system that affects the SCR catalyst. Either way, unusual smells or smoke should prompt an immediate visit to Barnes Brothers Fleet Maintenance in Dallas for a thorough diagnostic.

5. Frequent Regeneration Cycles

The Diesel Particulate Filter (DPF) requires periodic regeneration to burn off accumulated soot and keep the system clean. Under normal conditions, this process happens automatically and doesn’t disrupt your operations. However, if your truck’s DPF is frequently going into regeneration mode, it’s a sign that the filter is getting clogged more quickly than it should.

Frequent regeneration cycles can indicate a deeper issue, such as a malfunctioning sensor, poor-quality fuel, or an engine problem, causing it to produce more soot than usual. Addressing the root cause of the frequent regenerations can prevent premature wear on your DPF and other aftertreatment components.

6. Fluid Leaks

The aftertreatment system includes the Diesel Exhaust Fluid (DEF) system, which requires a steady supply of DEF to operate correctly. If you notice any fluid leaks around the DEF tank or lines, it’s a sign that something is wrong. DEF leaks can lead to problems, from reduced SCR efficiency to complete system failure.

At Barnes Brothers Fleet Maintenance, we recommend regular inspections of the DEF system to catch leaks before they cause severe damage. If you spot a leak, bring your truck in for service immediately to avoid costly repairs.

7. Unusual Noises

Unusual noises from your truck’s exhaust system can also indicate a problem with the aftertreatment components. For example, a rattling noise could suggest that the DOC or DPF is loose or damaged. These noises may also be accompanied by a drop in performance or an increase in exhaust emissions.

Unusual sounds should always be addressed. They often signal that something has come loose or is failing within the system, which could lead to more significant problems if left unchecked. Have your truck inspected by our experienced Barnes Brothers Fleet Maintenance team to diagnose and fix the issue promptly.

How Often Should You Service Your Aftertreatment System?

Regular maintenance of the aftertreatment system is essential for keeping your truck running efficiently and staying compliant with emissions regulations. We recommend having your aftertreatment system inspected at least once a year or every 100,000 miles, whichever comes first. However, if you notice any of the above signs, don’t wait for your next scheduled maintenance—bring your truck in for service as soon as possible.

Why Choose Barnes Brothers Fleet Maintenance for Aftertreatment System Maintenance in Dallas?

At Barnes Brothers Fleet Maintenance, we understand the unique challenges of operating a fleet of heavy-duty trucks in Dallas. Our team of certified technicians has the expertise to diagnose and repair issues with your aftertreatment system quickly and efficiently, minimizing downtime and keeping your trucks on the road. We use the latest diagnostic tools and techniques to ensure that your truck’s aftertreatment system is functioning correctly and that you’re getting the best possible performance from your vehicles.

Final Thoughts

The aftertreatment system is a critical component of your truck that ensures compliance with emissions regulations and helps protect the environment. By staying vigilant and watching for the signs of an aftertreatment system needing maintenance, you can avoid costly repairs and keep your fleet running smoothly. If you’re in Dallas and need expert aftertreatment system maintenance, don’t hesitate to contact Barnes Brothers Fleet Maintenance. We’re here to keep your trucks in top condition and your business moving forward.