2017-2022 Chevrolet Spark Ignition Coil Failure: Misfires, Diagnosis, and Replacement

Symptoms of a Failing Ignition Coil

When an ignition coil on your Chevrolet Spark starts to fail, it can cause several noticeable problems. Because each cylinder has its own coil, a single failure will disrupt the engine's smooth operation. The most common signs are related to engine performance and warning lights on your dashboard.

• Engine Misfires: This is the most common symptom. A misfire feels like the engine is sputtering, shaking, or hesitating, especially when you accelerate or when the car is idling at a stop. This happens because the cylinder with the bad coil isn't burning fuel properly.
• Check Engine Light: A failing ignition coil will almost always trigger the Check Engine Light. If the light is steady, you should get it checked soon. If it's flashing, it indicates a severe misfire that could damage your catalytic converter, and you should stop driving as soon as it's safe to do so.
• Reduced Power and Fuel Economy: With one cylinder not contributing fully, your engine's overall power will decrease. You might notice the car feels sluggish, especially when going uphill. The engine may try to compensate by using more fuel, leading to worse gas mileage.
• Difficulty Starting: If one or more coils are weak, the engine may struggle to start or take longer to turn over.
• Unusual Noises or Smells: In some cases, unburned fuel from the misfiring cylinder can enter the exhaust system and ignite, causing a loud popping sound known as backfiring. You might also smell gasoline from the exhaust.

The onboard computer stores trouble codes that identify the problem. For ignition coil issues, you will typically see one or more of the following codes:

Diagnosing a Bad Coil on Your Spark

If you have a code reader and it shows a misfire on a specific cylinder (e.g., P0302 for cylinder 2), you can perform a simple test to confirm if the coil is the problem.

Buying a Used Ignition Coil for Your 2017-2022 Spark

When replacing a failed ignition coil, buying a used OEM (Original Equipment Manufacturer) part can be a smart, cost-effective choice. OEM parts are designed by GM for your specific vehicle, ensuring proper fit and performance.

Physical Inspection Checklist

Before purchasing a used coil, inspect it carefully for any signs of damage or wear:

• Cracks or Damage: Check the plastic housing for any cracks, chips, or signs of melting. High heat can cause the plastic to become brittle.
• Corrosion: Look at the electrical connector pins. They should be clean and free of any green or white corrosion.
• Rubber Boot Condition: Inspect the rubber boot at the bottom of the coil. It should be soft and flexible, with no cracks, tears, or swelling. A damaged boot can allow moisture in or prevent a good seal with the spark plug.
• Mounting Point: Ensure the bolt hole for mounting the coil to the engine is intact and not cracked.

Why Choose Used OEM over New Aftermarket?

While cheap new aftermarket coils are widely available, a high-quality, low-mileage used OEM coil is often a better option. GM and ACDelco coils are made with high-quality materials, such as pure copper windings and coated steel laminations, to ensure durability and proper electrical performance. In contrast, some budget aftermarket parts may use inferior materials that can lead to premature failure, weak spark, and persistent engine problems.

Compatibility Check

Known Issues, Recalls, and Service Bulletins

As of mid-2024, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from GM or the NHTSA directly related to ignition coil failure on the 2017-2022 Chevrolet Spark. Failures appear to be isolated incidents due to normal wear and tear rather than a manufacturing defect. A recall for some 2023-2024 Chevrolet Low Cab Forward trucks mentioned an ignition coil pack fuse issue, but this does not apply to the Spark.

Cost of Replacement: New vs. Used

The cost can vary significantly depending on the type of part you choose and whether you do the work yourself.

Note: Prices are estimates and can vary by supplier and location. Shop labor costs are often for replacing the full set.

Ignition Coil Replacement Guide

Installation Difficulty

• Rating: 1 out of 5 (Very Easy)
• Estimated Time: 15-30 minutes
• DIY Feasible: Yes, this is a great job for beginners.

Tools Needed

• Ratchet with extension
• 10mm socket
• Torx bit (for engine cover)
• Dielectric grease (recommended)

Step-by-Step Instructions

1. Remove the Engine Cover: Unscrew the oil cap, remove the single Torx bolt holding the plastic engine cover, and then lift the cover off. You can put the oil cap back on to prevent debris from falling into the engine.
2. Locate the Ignition Coils: The four ignition coils are lined up in a row on top of the engine.
3. Disconnect the Electrical Connector: Slide the red safety tab back on the connector. Press the release tab and pull the connector straight off the coil.
4. Remove the Coil Bolt: Use a 10mm socket to remove the single bolt holding the ignition coil in place.
5. Remove the Old Coil: Gently twist and pull the ignition coil straight up to remove it from the spark plug well.
6. Install the New Coil: Apply a small amount of dielectric grease to the inside of the new coil's rubber boot. This helps with sealing and makes future removal easier. Press the new coil firmly down into the spark plug well until it seats.
7. Secure the New Coil: Reinstall the 10mm bolt and tighten it until it is snug. Do not overtighten.
8. Reconnect and Finish: Plug the electrical connector back in and push the red safety tab forward to lock it. Reinstall the engine cover, Torx bolt, and oil cap.

Technical Specifications & Part Numbers

These part numbers are often used interchangeably for the 2017-2022 Spark 1.4L engine. The primary OEM part is from GM/ACDelco, while Delphi and Standard Motor Products are reputable OE-quality alternatives.

Frequently Asked Questions (FAQ)