Spark Plug Replacement Guide for 2015-2024 Chevrolet Silverado 2500 HD Gas Engines
Keep your Silverado's V8 engine running strong by choosing the right spark plugs for the job.
- Only gasoline-powered Silverado 2500 HDs use spark plugs; Duramax diesels do not.
- For best performance and longevity, use Iridium spark plugs from OEM-equivalent brands like ACDelco or NGK.
- The recommended replacement interval for Iridium plugs is around 90,000-100,000 miles.
- Do not attempt to gap modern Iridium spark plugs as they are pre-set and can be easily damaged.
For Gas Engines Only
This article applies only to 2015-2024 Chevrolet Silverado 2500 HD trucks with gasoline engines (6.0L V8 and 6.6L V8). The Duramax diesel engine does not use spark plugs.
Signs of Failing Spark Plugs
When spark plugs wear out, they can't create a strong enough spark to burn the fuel properly. This can cause a range of problems. You might notice your truck feels 'off' or sluggish. Common symptoms include a rough idle, where the engine shakes or sputters when you're stopped. You may also experience engine misfires, which can feel like a hesitation or stumble during acceleration. Other signs are a noticeable drop in fuel economy, slower acceleration, and difficulty starting the engine. If the check engine light comes on and you get a code between P0300 and P0308, it often points to a misfire caused by a bad spark plug.
Choosing the Right Aftermarket Spark Plugs
For modern GM trucks, using a high-quality Iridium spark plug is highly recommended for performance and longevity. While cheaper options exist, they often don't last as long and can reduce performance.
Brand Tiers for Your Silverado 2500 HD
- Top Tier (OEM Equivalent): Brands like ACDelco and NGK are often the original equipment manufacturer (OEM) for General Motors. Choosing their Iridium plugs (such as ACDelco Iridium P/N 41-162) is the safest bet for factory performance and a long service life of up to 100,000 miles. Many owners and mechanics strongly recommend sticking with these brands.
- High-Quality Aftermarket: Denso and Bosch also produce excellent Iridium and Double Platinum spark plugs that are a reliable alternative to OEM. They are engineered to meet or exceed factory specifications and provide consistent performance.
- Standard/Economy: Brands like Autolite, Champion, and Skyward offer more budget-friendly options. While they will work, their copper or single platinum plugs typically have a much shorter lifespan than Iridium plugs and may need to be changed more frequently, sometimes as often as every 30,000 miles. These are best for a quick fix or if you're on a tight budget.
| Quality Tier | Common Brands | Price Range (Per Plug) | Typical Lifespan |
|---|---|---|---|
| Top Tier / OEM | ACDelco Iridium, NGK Iridium | $12 - $21 | ~90,000-100,000 miles |
| High-Quality Aftermarket | Bosch Iridium, Denso Iridium | $8 - $18 | ~70,000-100,000 miles |
| Standard / Economy | Autolite, Champion, Skyward | $4 - $10 | ~30,000-60,000 miles |
Known Issues, Recalls, and TSBs
Searches for recalls on the NHTSA website did not find any specific recalls for spark plugs on the 2015-2024 Silverado 2500 HD. However, a Technical Service Bulletin (TSB #14481) was issued for some earlier models regarding loose spark plug wire connections at the coil and plug, which could cause misfire-like symptoms. While not a recall, it's a good practice to ensure spark plug wires are securely seated during replacement.
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my Silverado 2500 HD?
The recommended replacement interval for the original Iridium spark plugs is typically around every 90,000 to 100,000 miles. However, if you use lower-quality platinum or copper plugs, you may need to change them as often as every 30,000 to 60,000 miles.
Should I gap my new Iridium spark plugs?
No. Most modern Iridium spark plugs from brands like ACDelco and NGK come pre-gapped from the factory. Attempting to gap them can damage the fine Iridium tip. Always check the box or manufacturer's instructions, but it's generally not recommended.
Is it hard to change the spark plugs myself?
The difficulty is moderate. While the process is straightforward, accessing the spark plugs on the V8 engine can be challenging, especially for the cylinders near the firewall. You will need a ratchet with extensions and a 5/8" spark plug socket. Some owners find it easier to access the rear plugs through the wheel wells.
Should I replace the spark plug wires and ignition coils at the same time?
It's a good idea to inspect the spark plug wires and boots for any cracks, brittleness, or corrosion when you change the plugs. If they are original and have high mileage, replacing them with the plugs is good preventative maintenance. Ignition coils are more expensive and are typically only replaced if they fail, which would cause a persistent misfire on one cylinder.
Helpful Videos
Technical Specifications
OEM Part Numbers: ACDelco 41-162 ACDelco 41-110 ACDelco 41-962
Engine compatibility: 6.0L V8 (2015-2019), 6.6L V8 (2020-2024). Plug Type: Iridium is recommended for longevity and performance. Socket Size: 5/8 inch.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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