Saturn Ion Ignition Coil & Module Guide (2003-2007)
Everything a 2003-2007 Saturn Ion owner needs to know about fixing ignition misfires.
- The ignition coil and ignition control module (ICM) should be replaced together as a single assembly.
- This is a very easy DIY repair that most owners can complete in under an hour with basic tools.
- Always replace the spark plugs at the same time to protect the new ignition components.
- Check for the critical ignition switch safety recall (NHTSA #14V171000) which is separate from this part.
Understanding Misfires in Your Saturn Ion
A common and frustrating issue for 2003-2007 Saturn Ion owners is a Check Engine Light accompanied by a rough-running engine. The cause is often a failure within the ignition system. For the 2.2L Ecotec engine, the ignition coils and the Ignition Control Module (ICM) are the most frequent culprits. These parts work together so closely that mechanics often recommend replacing them as a set. A failing coil can damage a new module, and a faulty module can destroy new coils, leading to a repeat failure.
Important Safety Recall Information
While not related to the ignition coil itself, all 2003-2007 Saturn Ion models were part of a major safety recall (NHTSA Campaign ID: 14V171000) for a faulty ignition switch. This defect can cause the engine to shut off while driving, disabling the airbags. It is critical to ensure this recall work has been performed on your vehicle. You can check your vehicle's status on the NHTSA website.
Is an Aftermarket Ignition Coil a Good Choice?
For an older vehicle like the Saturn Ion, aftermarket parts offer a sensible balance of cost and quality. The original equipment (OEM) part was supplied by ACDelco. Delphi was also a major parts supplier for GM and is considered a high-quality aftermarket choice, with some forum users suggesting the parts may be identical to the original ACDelco ones. Cheaper, budget-friendly brands can be a gamble; while they may work initially, their long-term durability is often not as reliable as OEM or premium aftermarket options. Given the tendency for related components to fail, investing in a quality coil and module assembly is a wise decision to avoid doing the job twice.
Choosing the Right Aftermarket Ignition Coil
When shopping for a replacement, you will find individual coils (for the 2.0L supercharged engine) and complete cassette-style coil packs (for the 2.2L engine). It's crucial to order the correct part for your specific engine. For the common 2.2L engine, it is highly recommended to purchase a kit that includes both the coil pack and the ignition control module.
Brand Tiers:
- Premium Brands (Closer to OEM): ACDelco, Delphi, NGK. These brands have a strong reputation for quality and are often manufactured to meet or exceed original specifications.
- Mid-Grade/Standard Brands: Standard Ignition, Hella, Hitachi, Walker Products. These offer a good balance of price and performance and are generally reliable.
- Economy Brands: DriveWire, True Tech, Global Parts. These are the most affordable options but may have a shorter lifespan and less consistent quality control.
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $200 - $350 |
| New Aftermarket (Premium) | $150 - $250 |
| New Aftermarket (Economy) | $70 - $140 |
| Shop Labor | $80 - $150 |
Pro Tip: Always replace the spark plugs when you replace the ignition coil assembly. Worn or fouled spark plugs can put extra strain on the new ignition components, leading to premature failure. It's an inexpensive way to protect your investment.
Frequently Asked Questions (FAQ)
Do I need to replace the ignition control module (ICM) with the coils?
Yes, it is highly recommended. On the Saturn Ion, a bad coil pack can quickly burn out a new ICM, and a bad ICM can destroy a new coil pack. Replacing them together as a complete assembly is the most reliable repair and prevents you from having to do the job again in a few days or weeks.
Is this a difficult job to do myself?
No, this is a very DIY-friendly repair. The ignition coil cassette is located on top of the engine and is held in by four 10mm bolts. The process involves removing the plastic engine cover, disconnecting one electrical connector, and removing the bolts. The entire assembly then lifts off. Basic hand tools are all that is required, and the job can typically be done in under an hour.
What are the signs of a failing ignition coil on a Saturn Ion?
The most common signs are a flashing or steady Check Engine Light, a rough idle, engine shaking or vibrating, poor acceleration, and reduced fuel economy. You may get diagnostic trouble codes like P0300 (Random Misfire) or codes specific to certain cylinders (P0301, P0302, etc.).
What is a TSB and does it apply to my car?
A Technical Service Bulletin (TSB) is a notice from the manufacturer to mechanics about a common, known issue. There is a TSB for the 2.2L engine in the Saturn Ion that describes a severe engine misfire on cylinders 1 and 4 or 2 and 3. It suggests inspecting specific wiring circuits for shorts before replacing the ignition module, though a faulty module is often the root cause.
Technical Specifications
OEM Part Numbers: 12580215 12570616 12599232
For the 2.2L Ecotec engine, this is a cassette-style coil-on-plug assembly that integrates the coils for all four cylinders into a single unit. It is typically sold with the accompanying ignition control module.
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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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