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Understanding Silverado HD Diesel Coverage and When to Extend Protection

If you drive a Silverado 2500HD or 3500HD with the Duramax turbo-diesel engine, you already know it’s built for serious work. These trucks are engineered to haul, tow, and take on high-mileage demands with ease. But even with all that capability, many owners wonder: Is the factory coverage enough—or should I consider extended protection?

Here’s what you need to know about Silverado HD diesel coverage, what’s included from the factory, and when it makes sense to buy extra protection.

What the Factory Warranty Covers on Diesel HD Trucks

All new Silverado HD models with the 6.6L Duramax turbo-diesel engine come with Chevrolet’s diesel-specific coverage:

Compared to the gas engine models, diesel trucks benefit from an extended powertrain term—covering the engine, transmission, and drivetrain for up to 100,000 miles.

But what’s not included?

Anything outside of the powertrain—such as infotainment systems, electronics, emissions components, and high-mileage failures not caused by manufacturer defects—is either limited or excluded entirely after the bumper-to-bumper warranty ends.

Why Many Diesel Owners Choose Extended Coverage

While the Duramax engine is known for durability, diesel trucks typically rack up mileage quickly—and more miles means more wear on critical systems.

Extended coverage helps protect against:

• Diesel exhaust fluid (DEF) system failures
• High-pressure fuel pump and injector issues
• Turbocharger problems
• EGR and emissions sensor malfunctions
• Costly electrical and infotainment failures

These issues may not appear in the first 3 years, but after 60,000–80,000 miles, repair bills can spike fast—especially if you’re towing or using the truck commercially.

Factory vs. Extended Coverage Comparison

How to Extend Your Silverado HD Diesel Coverage

Protecting your truck is quick and transparent through Granger. Here’s how:

1. Go to GrangerWarranty.com
2. Enter your truck’s year, mileage, and trim
3. Compare plans – Choose the level of protection you need
4. Pick your payment method – Upfront or low monthly payments
5. Checkout online – No hassle, no upsells

Why Heavy-Duty Diesel Owners Choose Granger

Granger offers dealership-backed extended warranty plans built specifically for truck owners. Unlike generic third-party contracts, our plans are designed for real-world use and give you:

• Transparent pricing
• Coverage up to 10 years or 150,000 miles
• Service at certified repair facilities nationwide
• Plans for both personal and commercial use
• A knowledgeable team that understands heavy-duty trucks

Frequently Asked Questions

Is extended coverage really necessary if I already have 5 years / 100,000 miles on the diesel powertrain?

Yes—because that coverage excludes components like electronics, emissions systems, DEF system, and more. Extended coverage fills in the gaps and lasts longer.

Can I buy coverage if my truck is already used?

Yes, as long as it’s within age and mileage limits. Granger covers most Silverado HD trucks under 10 years old and 120,000 miles.

What’s the best plan for diesel truck owners?

Most diesel owners choose a Premium plan to protect powertrain, electronics, fuel system, and emissions-related components well beyond factory coverage.

Don’t Let a Diesel Repair Catch You Off Guard

Whether you’re towing daily or planning to keep your Silverado HD long-term, extended coverage gives you confidence where it counts. Start your quote today at GrangerWarranty.com and get the protection your truck deserves.