Ignition Coil - Single

This procedure covers the removal and replacement of a single ignition coil on the 2016-2024 Hyundai Tucson with the 2.5L I4 gas engine.

Warnings

Tools required

Parts

• Ignition coil × 1 — Use OEM specification (Hyundai part number recommended)
• Spark plug (if damaged or at service interval) × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect negative battery terminal and wait at least 3 minutes
3. Identify which cylinder requires coil replacement (cylinders numbered 1-4 from timing belt side)
4. Remove engine cover if equipped by pulling upward on clips
5. Clean debris around ignition coil area with compressed air or vacuum to prevent contamination

Procedure

1. 1

   Disconnect ignition coil electrical connector
   Press down on the locking tab of the ignition coil connector and pull straight up to disconnect. Do not twist or pull on the wiring harness itself. Note the orientation of the connector for reassembly.
2. 2

   Remove ignition coil mounting bolt
   Using a 10mm socket and extension, remove the single bolt securing the ignition coil to the valve cover. Keep the bolt in a clean location for reinstallation.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
3. 3

   Extract ignition coil from spark plug well
   Grasp the ignition coil body firmly and pull straight upward with steady pressure. Use a slight twisting motion if needed, but do not force. If resistance is encountered, apply penetrating oil around the base and wait 10 minutes before attempting removal again. The coil boot should come out with the coil.
   ⚠Excessive force can break the coil boot or damage the spark plug. If coil is severely stuck, consider using a dedicated coil puller tool.
4. 4

   Inspect spark plug well and spark plug
   Use a flashlight to inspect the spark plug well for oil, coolant, or debris. If oil is present, valve cover gasket or tube seal replacement is needed. Inspect the visible portion of the spark plug for damage, excessive wear, or fouling. Replace spark plug if mileage interval has been reached or if damage is visible.
5. 5

   Remove and replace spark plug (if necessary)
   If replacing the spark plug, use a spark plug socket with extension to remove the old plug by turning counterclockwise. Inspect plug condition and gap on new plug (0.043 inches for 2.5L I4). Apply a small amount of anti-seize compound to spark plug threads, avoiding the electrode area. Thread new plug by hand first to ensure proper seating, then tighten to specification.
   ⚠Cross-threading spark plugs in aluminum heads can cause catastrophic engine damage requiring cylinder head replacement.
   Torque spec

   Spark Plugs - Aluminum Head20 Nm (15 lb-ft)
6. 6

   Prepare new ignition coil
   Inspect the new ignition coil boot for any damage or debris. Apply a thin coat of dielectric grease to the inside of the coil boot where it contacts the spark plug terminal. This prevents moisture intrusion and ensures easy future removal.
7. 7

   Install new ignition coil
   Align the ignition coil boot with the spark plug and press down firmly until the coil seats fully against the valve cover. The coil should sit flush with no gap. Install the mounting bolt finger-tight first, then torque to specification using a torque wrench.
   Torque spec

   Ignition Coil Bolts8 Nm (6 lb-ft)
8. 8

   Reconnect electrical connector
   Align the ignition coil electrical connector with the coil terminal in the correct orientation and press down firmly until you hear and feel a positive click. Gently tug on the connector to verify it is fully locked in place.
9. 9

   Reinstall engine cover and reconnect battery
   If an engine cover was removed, align the mounting clips and press down firmly until all clips engage. Reconnect the negative battery terminal.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify ignition coil mounting bolt is torqued to specification
3. Confirm engine cover is properly secured if equipped
4. Double-check that no tools or parts are left in the engine compartment

Verification

• Start the engine and listen for smooth idle with no misfires or rough running
• Verify no Check Engine Light illuminates after starting
• Use an OBD-II scanner to clear any stored misfire codes and confirm no new codes appear
• Rev engine gently to 2000-3000 RPM and verify smooth operation across RPM range
• Inspect ignition coil area for any signs of arcing, burning smell, or electrical noise

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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