Kia Forte5 Ignition Coil Guide: Understanding Misfires and Replacement (2012-2019)
If your 2012-2019 Kia Forte5 is running rough or has a check engine light on, a bad ignition coil could be the problem.
- A rough idle or flashing check engine light is the most common sign of a bad ignition coil.
- For 2017-2018 2.0L models, a TSB exists that recommends replacing all four coils for misfire codes.
- This is an easy, 30-minute DIY job that can save you hundreds in labor costs.
- For best results, replace all four coils and spark plugs at the same time using reputable brands like NGK or Delphi.
Is Your Forte5 Shaking or Sputtering?
A common complaint for the 2012-2019 Kia Forte5 is a rough idle, engine shaking, or a flashing check engine light. These are classic signs of an engine misfire, and a failing ignition coil is often the culprit. When a coil goes bad, the cylinder it's responsible for doesn't fire properly, causing the engine to run unevenly. This can happen at any time but is often more noticeable at idle or when accelerating.
Known Issues: TSB for 2017-2018 Forte 2.0L Engines
Service Bulletin SA321
Kia issued Technical Service Bulletin (TSB) SA321 for some 2017-2018 Forte models with the 2.0L MPI engine. This TSB addresses vehicles experiencing a check engine light with misfire codes (P0300, P0301, P0302, P0303, P0304). 🎬 Watch: Diagnosing a P0304 misfire code on a Kia Forte. The official procedure instructs technicians to replace all four ignition coils to resolve the issue. If you own one of these specific models and have these symptoms, this TSB is highly relevant.
Choosing the Right Aftermarket Ignition Coil
When replacing your ignition coils, you have options ranging from budget-friendly to premium. While saving money is tempting, extremely cheap coils can fail quickly, leaving you with the same problem. It's best to choose a reputable brand.
- Premium / OEM-Equivalent Brands (Recommended): Brands like NGK, Delphi, Hitachi, and Denso are often the original equipment (OE) manufacturers for many car brands, including Kia. Choosing one of these ensures fit and performance that is equal to or better than the original part. They are the most reliable choice for a long-term repair.
- Quality Aftermarket Brands: Brands such as Standard Ignition (SMP), Walker Products, and Holstein offer a good balance of quality and price. They are dependable alternatives to the premium brands and are a solid choice for most owners.
- Economy Brands: The lower end of the price spectrum includes many lesser-known or unbranded options. While the low price is attractive, quality and durability can be a gamble. It is generally recommended to invest in a more reputable brand to avoid having to do the job twice.
Pro Tip: Replace Coils and Plugs Together
While you're replacing the ignition coils, it's the perfect time to replace your spark plugs. Worn spark plugs can put extra strain on new ignition coils, causing them to fail prematurely. For best results and long-term reliability, always install new spark plugs with new coils.
🎬 See this step-by-step coil and spark plug replacement guide.How Much Does It Cost to Replace a Kia Forte5 Ignition Coil?
The cost depends on whether you do it yourself or hire a shop. The replacement is very simple and accessible on the Forte5's engine, making it an excellent DIY task that can save you a lot of money.
| Part / Service | Estimated Cost |
|---|---|
| New Aftermarket Ignition Coil (Single) | $22 - $80 |
| New Aftermarket Ignition Coils (Set of 4) | $80 - $250 |
| New OEM Ignition Coils (Set of 4) | $250 - $400 |
| Shop Labor | $75 - $150 |
Cost estimates are approximate and can vary based on location, brand, and vehicle engine type.
Frequently Asked Questions
Should I replace all four ignition coils at once?
It is highly recommended. Ignition coils are all the same age and have been exposed to the same conditions. If one has failed, the others are likely not far behind. Replacing them all at once saves you from future repeat repairs. The TSB for 2017-2018 models specifically calls for replacing all four.
Is this a difficult repair to do myself?
No, this is one of the easiest repairs you can do. The coils are located right on top of the engine, held by a single bolt each. Basic hand tools (a 10mm socket) are all that's needed. The entire job for all four coils can be done in under 30 minutes, even for a beginner.
What happens if I don't replace a bad ignition coil?
Continuing to drive with a bad coil can cause more problems. The unburned fuel from the misfiring cylinder can get into the exhaust and damage the expensive catalytic converter. You'll also experience poor performance, bad gas mileage, and could eventually stall.
How do I know which coil is bad?
A mechanic's scan tool can tell you which cylinder is misfiring (e.g., code P0302 for cylinder 2). A common DIY trick is to swap the suspected bad coil with a coil from another cylinder. For example, if you have a P0302 code, swap the coil from cylinder 2 with cylinder 1. If the code changes to P0301, you've confirmed the coil is the problem.
🎬 Watch: How to quickly diagnose multiple misfire codes yourself.Are the coils different for the 1.6L Turbo and 2.0L engines?
Yes, it is very likely that different engines use different ignition coils. The 1.6L GDI, 1.6L Turbo GDI, and 2.0L MPI/GDI engines may all have unique parts. Always verify the part number fits your specific year, model, and engine before purchasing.
Helpful Videos
Technical Specifications
Part numbers for ignition coils on the 2012-2019 Kia Forte5 vary significantly based on the engine (1.6L, 2.0L, 1.6L Turbo) and production date. Always verify fitment with your vehicle's VIN before ordering. For the TSB affecting some 2017-2018 2.0L MPI models, the replacement coil part number is 27300-2E601.
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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.
- Kia Forte5:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Forte5 Shaking or Sputtering?
- Known Issues: TSB for 2017-2018 Forte 2.0L Engines
- Service Bulletin SA321
- Choosing the Right Aftermarket Ignition Coil
- Pro Tip: Replace Coils and Plugs Together
- How Much Does It Cost to Replace a Kia Forte5 Ignition Coil?
- Frequently Asked Questions
- 🎟️ Get 5% Off