Chevrolet Trailblazer Spark Plug Replacement Guide for 2021-2024 Models
Keep your Trailblazer's 1.2L or 1.3L turbo engine running smoothly with the right new aftermarket spark plugs.
- This guide applies to the 2021-2024 North American Trailblazer with the 1.2L or 1.3L 3-cylinder engine.
- Always use high-quality Iridium spark plugs from brands like ACDelco, NGK, or Bosch for these turbocharged engines.
- Replacement is a simple DIY task that requires a special 14mm thin-wall spark plug socket and can be done in under 30 minutes.
- A known TSB (PIP5628G) exists for diagnosing engine misfires, a common symptom of failing spark plugs.
A Note on Vehicle Model Years
While this guide is for the 2016-2024 Chevrolet Trailblazer, it's important to know that the Trailblazer was reintroduced to the North American market for the 2021 model year. If you have a 2021, 2022, 2023, or 2024 model with a 1.2L or 1.3L 3-cylinder engine, you are in the right place. There was no Trailblazer model sold in the US or Canada between 2016 and 2020.
When to Replace Your Spark Plugs
Your Trailblazer uses modern iridium spark plugs, which last much longer than old copper plugs. You should check your owner's manual for the exact replacement interval, but a general guideline is every 60,000 to 100,000 miles. However, you might need to replace them sooner if you notice symptoms of failure. 🎬 Watch: Common symptoms of bad spark plugs to look for. Ignoring bad spark plugs can lead to a rough-running engine, poor fuel economy, and potential damage to other expensive parts like the ignition coils or catalytic converter.
Choosing the Right Aftermarket Spark Plug
The 1.2L and 1.3L turbo engines in your Trailblazer require high-quality iridium spark plugs for best performance. Using a lower-quality plug can lead to misfires and poor longevity. Here’s a breakdown of available brands:
- Tier 1 - OE & Premium Aftermarket (ACDelco, NGK): ACDelco is the original equipment (OE) manufacturer for GM, so their plugs are a guaranteed fit and performance match. NGK is a world-renowned OE supplier and their Laser Iridium plugs are considered an equivalent or even an upgrade, offering excellent performance and durability.
- Tier 2 - Quality Aftermarket (Bosch): Bosch offers OE-quality Double Iridium plugs that are a reliable choice. They are engineered for long life and high performance, making them a great alternative to the original parts.
- Tier 3 - Standard Aftermarket (Champion): Champion provides a functional and more budget-friendly option. While they meet the basic requirements, premium brands are generally recommended for modern, high-efficiency turbocharged engines.
Known Issues, TSBs, and Recalls
As of early 2026, there are no specific recalls for spark plugs on the 2021-2024 Chevrolet Trailblazer. However, Chevrolet has issued Technical Service Bulletin (TSB) #PIP5628G, which addresses diagnostics for engine misfire codes (P0300-P0308). This indicates that while not a recall, misfires are a known issue that dealers have specific instructions for diagnosing, and faulty spark plugs are a primary cause.
🎬 See how to diagnose and fix a misfire under load.DIY Replacement Information
Replacing the spark plugs on a 2021-2024 Trailblazer is a straightforward job that most DIYers can handle. 🎬 Watch this step-by-step spark plug and coil replacement walkthrough. The engine's 3-cylinder layout provides easy access to all plugs and coils. You will need a T30 Torx bit for the engine cover, an 8mm socket for the coil bolts, and a special 14mm thin-wall spark plug socket. Always use a torque wrench to tighten the new plugs to the manufacturer's specification (around 13-14 ft-lbs) to avoid engine damage.
Frequently Asked Questions
How many spark plugs does my Trailblazer need?
Your Trailblazer has a 3-cylinder engine, so you will need to purchase three spark plugs.
Do I need to gap the new spark plugs?
No. Modern iridium spark plugs for the Trailblazer come pre-gapped from the factory. You should not try to change the gap, as you can easily damage the fine iridium tip.
What are the most common tools needed for the job?
You will need a ratchet, an extension, a T30 Torx socket, an 8mm socket, a 14mm thin-wall magnetic spark plug socket, and a torque wrench.
Should I use dielectric grease?
Yes, it is good practice to apply a small amount of dielectric grease to the inside of the ignition coil boot before reinstalling it. This prevents the boot from sticking to the new spark plug and helps seal out moisture.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12681663 41-106IP 41-156 12683541
The Trailblazer's 1.2L and 1.3L engines require different, engine-specific Iridium spark plugs. They come pre-gapped from the factory and should not be adjusted. A 14mm thin-wall socket is required for installation.
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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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