Choosing the Right Spark Plugs for Your 2013-2019 Cadillac ATS
Keep your ATS engine running strong by understanding which spark plugs you need and why.
- Stick with iridium spark plugs from reputable brands like ACDelco, NGK, or Denso to maintain factory performance.
- For 2.0L Turbo and 3.6L V6 engines, plan to replace spark plugs every 60,000 miles.
- If you have a 2013 ATS with the 2.0L Turbo engine, ensure the correct colder heat range plugs are used per GM's service bulletin.
- While a DIY replacement is feasible for 4-cylinder engines, the 3.6L V6 is significantly more difficult due to intake manifold removal.
Signs of Failing Spark Plugs in a Cadillac ATS
When spark plugs wear out, they can't create a strong enough spark. This can lead to a variety of noticeable engine problems. If you experience any of these symptoms, your spark plugs might be the culprit.
- Rough Idle: The engine may shake or vibrate more than usual when the car is stopped.
- Poor Acceleration: You might feel a hesitation or lack of power when you press the gas pedal.
- Reduced Fuel Economy: Worn plugs cause an inefficient burn, meaning you'll be filling up your tank more often.
- Engine Misfires: The engine may stumble or lose power for a moment. This can trigger a flashing Check Engine Light and set trouble codes like P0300 (Random Misfire) or P0301-P0306 for specific cylinders. 🎬 See how to diagnose a P0300 random misfire code.
- Difficulty Starting: Weak plugs can make it harder for the engine to turn over, especially in cold weather.
Known Issue for 2013 2.0L Turbo Engines
General Motors issued a special program (Bulletin No.: 14311) for some 2013 Cadillac ATS models with the 2.0L Turbo (LTG) engine. The issue involved potential engine pre-ignition that could lead to piston damage. The fix required a dealer to reprogram the Engine Control Module (ECM) and install spark plugs with a colder heat range. While this program expired in 2016, it highlights the importance of using the correct, updated spark plugs for this specific engine.
Choosing the Right Aftermarket Spark Plugs
Your Cadillac ATS was equipped from the factory with high-quality iridium spark plugs, most often from ACDelco. When shopping for aftermarket replacements, it's best to stick with iridium plugs to maintain original performance and longevity. Cheaper platinum or copper plugs will not last as long and may reduce performance.
Brand Tiers for Your ATS
Not all aftermarket brands are created equal. Here’s how they generally stack up for your Cadillac:
- OEM / Premium Aftermarket (Recommended): These brands meet or exceed GM's original specifications. They are the safest bet for reliability and performance.
- ACDelco: This is the original GM parts brand. Choosing ACDelco Professional or GM Original Equipment iridium plugs is the closest you can get to the factory part. Many owners and technicians stand by them for their proven reliability.
- NGK: A top-tier Japanese brand that is often the original equipment manufacturer for many automakers. NGK Laser Iridium or Iridium IX plugs are excellent, high-quality alternatives to OEM.
- Denso: Another highly-respected Japanese OE supplier. Their Iridium TT or Iridium Long Life plugs are comparable in quality and performance to ACDelco and NGK.
- Quality Aftermarket: These brands offer good performance and are a solid choice if the premium brands aren't available.
- Bosch: A well-known German brand that produces quality iridium plugs. Their Double Iridium series is a popular choice.
- Champion: This American brand offers iridium plugs that provide reliable performance for daily driving.
- Budget-Friendly Options: While brands like Autolite are available, it is strongly recommended to use iridium plugs in your ATS for proper performance and to avoid premature wear. Using basic copper plugs is not advised.
Always Check the Gap
Even though most iridium spark plugs come pre-gapped, it's a good practice to verify the gap with a feeler gauge before installation. The correct gap for most ATS engines is typically around 0.035 inches, but always confirm with your owner's manual or a parts lookup. Never attempt to adjust the gap on an ACDelco Iridium plug, as you can damage the fine tip; if it's incorrect, you should replace it.
Spark Plug Replacement Cost for Cadillac ATS
The cost to replace spark plugs can vary based on your engine and whether you do it yourself or use a repair shop. The 3.6L V6 engine is more labor-intensive as the intake plenum must be removed to access the rear plugs.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (Iridium) | $8 - $22 per plug |
| New OEM (ACDelco) Spark Plugs | $9 - $17 per plug |
| Shop Labor | $122 - $250+ |
| Total Professional Replacement | $189 - $400+ |
Frequently Asked Questions
When should I replace the spark plugs on my Cadillac ATS?
For the 2.0L Turbo and 3.6L V6 engines, the recommended interval is every 60,000 miles. For the 2.5L engine, the interval is typically longer, around 100,000 miles, but it's always best to check your owner's manual. If you have a tuned engine or drive aggressively, you may need to replace them sooner.
Is it difficult to replace the spark plugs myself?
For the 2.0L Turbo and 2.5L 4-cylinder engines, the job is straightforward for a DIYer 🎬 Watch this step-by-step guide for replacing 2.0L spark plugs. with basic tools. The 3.6L V6 is more complex because the upper intake manifold must be removed to access the spark plugs, making it a more challenging job.
Do I need special tools to change the spark plugs?
You will need a ratchet with extensions, a 5/8-inch spark plug socket, a 10mm socket, and a T30 Torx bit for the engine cover. A torque wrench is highly recommended to tighten the new plugs to the correct specification (usually around 15 ft-lbs).
My check engine light is on with a P0300 code. Is it the spark plugs?
A P0300 random misfire code is often caused by worn spark plugs. However, it can also be caused by a bad ignition coil, a faulty fuel injector, or other engine issues. If you replace the plugs and the code returns, the ignition coils are the next most common part to check.
🎬 Learn how a faulty ignition coil causes similar misfire symptoms.Helpful Videos
![Cadillac ATS CTS 2.0 [Spark Plug Replacement]](https://img.youtube.com/vi/YsbcJnZlT2g/mqdefault.jpg)
Technical Specifications
OEM Part Numbers: 12681660 12646780 12680074 12662396 12681659 41-125
Material: Iridium Socket Size: 5/8 inch Common Gap Size: 0.035 inches Engine Variants: 2.0L Turbo I4, 2.5L I4, 3.6L V6
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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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