Wondering what to watch out for with your Silverado? Here are the most common issues:
While the 6.6L Duramax Diesel engine in Chevrolet Silverado HD trucks is generally known for its reliability, there are a few recurring problems that owners should be aware of. These issues can affect performance and longevity if not addressed early.
1. Fuel starvation due to air in the fuel lines
The Duramax fuel system uses a single high-pressure fuel pump that draws fuel from the tank and sends it under pressure to the injectors. This setup creates a vacuum between the pump and the tank, which can pull in air at weak points—similar to how a broken straw would let air in. Common culprits include a cracked fuel filter housing, failed O-rings, or leaking gaskets. Many owners also report difficulty in priming the fuel system after replacing the fuel filter, which can lead to starting issues or stalling.
2. Water pump failure
Water pump failure is a relatively common issue on Duramax engines, typically occurring between 80,000 and 100,000 miles. While the cause may be more related to the manufacturer of the water pump than the vehicle itself, it’s still a frustrating and costly repair when it happens. Regular maintenance checks can help identify early signs of wear before it leads to overheating or engine damage.
3. Overheating
Overheating isn’t a universal problem with all Duramax engines, but it does seem to occur more frequently compared to other diesel engines. A faulty water pump is one of the main causes, but heavy towing during hot weather can also contribute. Another common issue is a malfunctioning fan clutch, which prevents proper airflow through the radiator. Additionally, a clogged or dirty radiator can restrict coolant flow, leading to overheating conditions.
At JD Diagnostics & Diesel Repair, located in Abbotsford, BC, we specialize in providing top-notch service for your Silverado. From routine maintenance to full engine rebuilds, our team has the expertise to keep your truck running smoothly. We serve the local Fraser Valley area and are committed to delivering quality care and honest advice.
Looking for more power?
Our partner company,
3K Calibrations, offers expert ECM tuning for all diesel vehicles. Whether you're looking to boost performance or need help with EGR, DPF, or UREA system issues, they have the tools and knowledge to get the job done right.
Want to learn more about available ECM tunes?
Give us a call today to find out how we can help improve your truck's performance and efficiency.
604-799-3835
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