🔧 1500 - Ignition Coil Replacement

Replacing the ignition coils on your 1500 is a straightforward job on the 5.7L HEMI. Each cylinder has its own coil-on-plug ignition coil mounted above the spark plug area, and a weak coil can cause misfires, rough idle, poor acceleration, or a check engine light.

Difficulty Level: Beginner | Estimated Time: 1-2 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before starting. The ignition coils sit near hot cylinder heads and exhaust components.
• ⚠️ Disconnect the negative battery cable to prevent accidental electrical shorts.
• ⚠️ Do not pull on ignition coil wires or connector wires. Pull only on the connector body.
• ⚠️ Replace coils one at a time so the wiring stays routed correctly.
• ⚠️ If you are replacing all coils, keep debris out of the spark plug wells.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 13mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive extension set
• Torque wrench, inch-pound range
• Trim clip removal tool
• Small flathead screwdriver
• Compressed air blow gun
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1-8
• Dielectric grease - Qty: 1 small tube

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📋 Before You Begin

• 🅿️ Park your 1500 on level ground and set the parking brake.
• ❄️ Allow the engine to cool for at least 30-60 minutes if it was recently driven.
• 🔋 Use a 10mm socket to disconnect the negative battery cable, then position the cable where it cannot touch the battery post.
• 🧼 Blow loose dirt away from the ignition coil areas with a compressed air blow gun before removing any coils.
• 🔎 A coil-on-plug coil means the ignition coil sits directly over the spark plug instead of using a long spark plug wire.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Engine Cover

• Use both hands to lift the plastic engine cover straight upward from the rubber mounting grommets.
• If equipped with clips or retainers, use a trim clip removal tool to release them gently.
• Set the cover aside where it will not get scratched or stepped on.
• Lift evenly, not from one corner.

Step 2: Disconnect the Negative Battery Cable

• Use a 10mm socket and 3/8-inch drive ratchet to loosen the negative battery terminal clamp nut.
• Remove the negative cable from the battery post.
• Move the cable aside so it cannot spring back and touch the post.

Step 3: Locate the Ignition Coils

• Look along both valve covers. Your 1500 has 8 ignition coils total, one for each cylinder.
• Each coil has an electrical connector and is secured by mounting bolts.
• If replacing only one coil, match it to the cylinder identified by the diagnostic trouble code, such as P0301 for cylinder 1 misfire.

Step 4: Clean Around the Coil Area

• Put on safety glasses.
• Use a compressed air blow gun to remove dust, leaves, and grit from around the coil you are replacing.
• This prevents dirt from falling into the spark plug well when the coil is removed.

Step 5: Unplug the Ignition Coil Connector

• Press the electrical connector release tab with your thumb.
• If the tab is stiff, use a small flathead screwdriver to gently lift the lock while pulling the connector body rearward.
• Do not pry hard. The connector plastic can become brittle from engine heat.
• Pull the plug, not the wires.

Step 6: Remove the Ignition Coil Mounting Bolts

• Use a 10mm socket, 3/8-inch drive extension, and 3/8-inch drive ratchet to remove the ignition coil mounting bolts.
• Keep the bolts in a small safe spot so they do not fall into the engine bay.
• Some nearby brackets or covers may use 13mm fasteners. Use a 13mm socket only if access requires bracket removal.

Step 7: Remove the Old Ignition Coil

• Grip the coil body firmly by hand.
• Twist the coil slightly left and right to break the rubber boot loose from the spark plug.
• Pull the coil straight upward and out.
• If the boot stays stuck on the spark plug, remove it carefully by hand or with gentle finger pressure. Do not damage the spark plug.

Step 8: Prepare the New Ignition Coil

• Compare the new ignition coil with the old one. The connector shape, bolt holes, and boot length should match.
• Apply a tiny amount of dielectric grease inside the end of the rubber coil boot.
• Dielectric grease is a non-conductive silicone grease that helps keep moisture out and makes future removal easier.
• Do not pack the boot full of grease.

Step 9: Install the New Ignition Coil

• Push the new ignition coil straight down into place by hand.
• You should feel the boot seat onto the spark plug.
• Start the mounting bolts by hand first to avoid cross-threading.
• Use a 10mm socket and torque wrench to tighten the ignition coil bolts to Torque to 8 Nm (71 in-lbs).
• Hand-start bolts before using tools.

Step 10: Reconnect the Electrical Connector

• Push the ignition coil electrical connector onto the new coil until it clicks.
• Lightly tug the connector body to confirm it is locked in place.
• Make sure the wiring is not stretched, pinched, or resting against sharp edges.

Step 11: Repeat for Additional Coils

• If replacing more than one coil, repeat Steps 4 through 10 for each coil.
• Replace one coil at a time so you do not mix up connectors or hardware.
• If replacing all 8 coils, work from front to rear on one bank, then repeat on the other bank.

Step 12: Reinstall the Engine Cover

• Position the plastic engine cover over its mounting grommets.
• Press down firmly by hand until it seats evenly.
• If any clips or retainers were removed, reinstall them using your hands or a trim clip removal tool.

Step 13: Reconnect the Battery

• Place the negative battery cable back onto the negative battery post.
• Use a 10mm socket and 3/8-inch drive ratchet to tighten the clamp until snug.
• Do not overtighten the battery terminal clamp.

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✅ After Repair

• ✅ Start the engine and let it idle for 1-2 minutes.
• ✅ Listen for smooth idle and check that there are no warning messages.
• ✅ If a check engine light was on, use a compatible scan tool to clear stored misfire codes after confirming the repair.
• ✅ Test drive your 1500 gently for 10-15 minutes and confirm there is no hesitation, shaking, or flashing check engine light.
• ✅ If the same cylinder misfire returns, the spark plug, injector, compression, wiring, or PCM driver circuit may need further diagnosis.

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💰 DIY vs Shop Cost

Shop Cost: $250-$900 depending on how many coils are replaced

DIY Cost: $45-$480 depending on coil quantity and brand

You Save: $150-$420 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-2.0 hours.

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