🔧 Ignition Coils - Replacement

Your ignition coils send high-voltage spark to the plugs. On your Silverado, they are mounted on the engine and can be replaced one at a time, but it’s smart to inspect the plug wires and boots while you’re in there. If one coil failed, the others may still work, but age and heat can weaken them too.

Difficulty Level: Beginner | Estimated Time: 1.5-3 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Coils and exhaust parts can stay hot.
• Turn the key off and remove it from the vehicle.
• Disconnect the negative battery cable before touching coil connectors.
• Do not pull on the spark plug wires by the wire itself. Pull from the boot, which is the rubber end.
• Avoid using metal tools on the coil terminals.
• If a coil is oil-soaked, fix the leak first or the new coil may fail early.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4-inch ratchet
• 6-inch extension
• Torque wrench, inch-pound
• Trim panel tool
• Needle-nose pliers
• Dielectric grease
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil set - Qty: 6
• Dielectric grease - Qty: 1
• Ignition coil bolt set - Qty: 6

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully before touching the coils.
• Disconnect the negative battery cable before unplugging coils.
• Work on one cylinder at a time so the wires stay in the correct order.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect battery power

• Use a 10mm socket to remove the negative battery cable.
• Move the cable aside so it cannot spring back and touch the terminal.

Step 2: Clear access to the coils

• If the engine cover is installed, lift it off by hand.
• If the intake duct blocks access, loosen it with a 10mm socket or release clamps as equipped.
• Take a photo first.

Step 3: Remove one coil wire and connector at a time

• Press the lock tab and unplug the electrical connector from the first coil.
• Grip the spark plug wire boot and pull it straight off the coil.
• Do not yank the wire itself.

Step 4: Remove the coil

• Use a 10mm socket and 1/4-inch ratchet to remove the coil retaining bolt.
• Lift the coil straight up and out.

Step 5: Install the new coil

• Compare the new coil to the old one before installing.
• Apply a small amount of dielectric grease inside the coil boot.
• Set the coil in place and install the bolt by hand first.
• Use a torque wrench, inch-pound to tighten the coil bolt to 10 Nm (89 in-lbs).

Step 6: Reconnect the wire and connector

• Push the spark plug wire boot onto the new coil until it seats fully.
• Reconnect the electrical connector until it clicks.
• Repeat Steps 3 through 6 for each remaining coil, one at a time.

Step 7: Reassemble and reconnect power

• Reinstall the intake duct or engine cover if removed.
• Reconnect the negative battery cable with a 10mm socket.
• Tighten the battery terminal snugly.

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✅ After Repair

• Start the engine and let it idle.
• Check for rough running, flashing check engine light, or misfires.
• If the engine still runs rough, inspect the spark plug wires and spark plugs.
• Clear any stored codes with a scan tool if needed.

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $180-$420 (parts only)

You Save: $270-$480 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.