Servicing Commercial Trucks: Emissions System & Check Engine Light

The sudden appearance of the emission system warning light in your commercial truck can undoubtedly be a source of frustration and concern. Dealing with unexpected issues like this can be particularly challenging, especially when the reliable performance of your truck is essential for your work and business. At Peach State Truck Centers, we understand just how important it is to reduce downtime and get your truck back on the road, and one of the most common issues we come across with our customers is emission control system failure.

What is the Emission System in a Commercial Truck?

The emission system in a commercial truck is a critical component designed to minimize harmful pollutants released into the atmosphere from the engine's exhaust. It typically includes various technologies such as,

• Diesel particulate filters (DPF)
• Selective catalytic reduction (SCR)
• Exhaust gas recirculation (EGR)
• Diesel oxidation catalysts (DOC)

These systems work together to reduce emissions of nitrogen oxides (NOx), particulate matter (PM), and other pollutants, ensuring compliance with environmental regulations while maintaining optimal engine performance and fuel efficiency.

Engine and Emission Control System Warning Light

Emissions and the engine are closely related, as the engine is the primary source of emissions in any vehicle. They work together to optimize performance, fuel efficiency, and emissions reduction. Regular maintenance and adherence to emissions regulations are essential to ensure that commercial trucks continue to operate efficiently and responsibly.

What Does “Check Emission System Mean?”

When you see the "Check Emission System" warning message in a vehicle, it typically indicates that there's a problem with one or more components of the emission control system. This could be due to various issues such as a malfunctioning sensor, a problem with the catalytic converter, a leak in the exhaust system, or issues with the engine management system. It's essential to address this warning promptly as it can affect the vehicle's performance, fuel efficiency, and environmental impact. Consulting a qualified technician to diagnose and fix the underlying issue is strongly advised.

Can You Drive With an Emission Control System Light On?

Driving with the emission control system warning light on is generally not recommended. While the vehicle may still operate, the warning light indicates that there's an issue with the emission control system that could lead to potential damage to the engine or emission control components. Continuing to drive with the light on could exacerbate the problem and lead to more costly repairs down the line.

Check Engine Light Flashing

If the check engine light is flashing on a commercial truck, it indicates a serious issue that needs immediate attention. A flashing check engine light typically signals a severe problem such as a misfire in the engine, which can lead to significant damage if not addressed promptly by a knowledgeable technician.

What to Do When Check Engine Light Comes On

Continuing to drive the truck with a flashing check engine light can potentially cause additional damage to the engine or emission control components.

It's essential to pull over safely as soon as possible and have the truck inspected by a qualified mechanic or technician. They can diagnose the issue and determine the appropriate course of action to resolve it. Ignoring a flashing check engine light on a Freightliner truck can result in costly repairs and downtime. Therefore, it's best to address the problem promptly to prevent further damage and ensure the truck's safe operation.

Peach State Truck Centers’ Commercial Truck Service

Peach State’s service capabilities are vast, as we offer electrical diagnostic and repair, in addition to small/light dump body repairs. Submit a service request with our factory-trained diagnostic and repair technicians today to get you back on the road.