Saturn Sky Ignition Coil Guide (2007-2010): Symptoms and Replacement
Fix engine misfires and poor performance by choosing the right replacement ignition coil for your Sky.
- A flashing check engine light indicates a severe misfire that can damage your catalytic converter; avoid driving if possible.
- Confirm a bad coil by swapping it to another cylinder and seeing if the misfire code follows it.
- For best results, replace all four ignition coils and spark plugs at the same time, especially on higher-mileage vehicles.
- Stick with reputable brands like ACDelco, Delphi, or NGK for a reliable, long-lasting repair.
Is Your Saturn Sky's Ignition Coil Failing?
A bad ignition coil is a common problem that can make your Saturn Sky run poorly. Symptoms often start small but get worse over time. The most obvious sign is a Check Engine Light, which will be triggered by your car's computer when it detects a problem in the ignition system. You will likely feel the engine sputtering, shaking, or vibrating, especially when idling at a stoplight. Other common signs include a noticeable loss of power when accelerating, worse gas mileage, and in some cases, a popping or banging sound from the exhaust, known as backfiring.
Choosing the Right Aftermarket Ignition Coil
When shopping for a replacement, you'll find several brands available. For a critical part like an ignition coil, brand quality matters. They generally fall into three tiers.
- OEM & Premium Aftermarket: These are the highest quality and most reliable options. ACDelco is the original GM-recommended part, and Delphi is also a trusted original equipment manufacturer. Brands like NGK, Hitachi, and Denso are well-respected Japanese manufacturers known for excellent quality and are a safe bet for longevity.
- Quality Mid-Range Aftermarket: Brands like Standard Ignition (SMP), Hella, and Walker Products offer a good balance of price and quality. They are established companies that produce reliable parts, though they may not have the same OE pedigree as the premium brands.
- Economy Brands: This tier includes brands like DriveWire, True Tech, and other lower-cost options. While the price is attractive, their long-term reliability can be inconsistent. These are best suited for a budget-focused repair, but you may find yourself replacing them again sooner than you would with a premium part.
Pro Tip: Replace Coils and Plugs Together
If your Sky has over 60,000 miles or you don't know when the spark plugs were last changed, it's a smart move to replace all four spark plugs 🎬 Watch: How to replace spark plugs and coils on the turbo engine. at the same time as your ignition coils. Worn spark plugs can put extra strain on the new coils, potentially causing them to fail prematurely. Both the 2.4L and 2.0L Turbo engines use the same ignition coil, which simplifies ordering.
Known Issues for the 2007-2010 Saturn Sky
While there are no recalls specifically for the ignition coils, there is a GM Technical Service Bulletin (TSB PIP5038B) that addresses issues like repeated coil failures, engine shudder, and misfires. The TSB notes that these problems can sometimes be caused by bad electrical grounds or electromagnetic interference affecting the engine computer. If you replace a coil and the problem quickly returns on the same cylinder, it's worth having a mechanic check the related wiring and grounds.
How Much Does a Saturn Sky Ignition Coil Cost?
The cost depends on the brand you choose and who does the work. Replacing the ignition coils is a very simple DIY job that most owners can do in under an hour with basic tools.
🎬 Watch this quick walkthrough on how to change your ignition coil.| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil | $38.48 - $137.95 (per coil) |
| New OEM Ignition Coil (ACDelco) | $70 - $150 (per coil) |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
Is there a recall on the Saturn Sky ignition system?
Yes, but it's important to know what it covers. There were major recalls for the ignition switch and lock cylinder on the 2007-2010 Saturn Sky. This issue could cause the key to slip out of the 'run' position, shutting off the engine while driving. This recall does NOT cover the ignition coils themselves, which are a separate part of the system.
Should I replace one bad coil or all four?
If one coil fails due to age and heat, the others are likely not far behind. For the best long-term results and to avoid doing the same job again in a few months, it is highly recommended to replace all four ignition coils at the same time.
How can I test my Saturn Sky's ignition coils?
The easiest way for a DIYer is the 'swap test'. First, use an OBD-II scanner to find the misfiring cylinder (e.g., code P0302 for cylinder 2). Then, swap the suspected bad coil from cylinder 2 with a known good coil from another cylinder, like cylinder 1. Clear the codes and drive the car. If the code changes to P0301 (cylinder 1 misfire), you've confirmed the coil is faulty. Caution: A GM service bulletin warns never to crank the engine with more than one ignition coil disconnected, as it can cause electrical damage to the coils. Test them one at a time. 🎬 See these quick tests to find what is causing your misfire.
Do the 2.4L base model and 2.0L Red Line use different ignition coils?
No, both the naturally aspirated 2.4L engine and the 2.0L turbocharged engine in the Red Line model use the same ignition coils for the 2007-2010 model years. This makes finding the correct part straightforward.
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Technical Specifications
OEM Part Numbers: 12638824 12578224 12629646
This vehicle uses a 4-pin, coil-on-plug style ignition coil. Common aftermarket cross-reference part numbers include UF491, D522C, C1552, and GN10485.
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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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