Quick answer: Spark Plug Replacement on a 2009–2017 Chevrolet Traverse is rated Advanced and takes about 1-3 hours. You'll need 4 tools for this job, and parts cost about $115. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Correct spark plug set for 2009-2017 Chevrolet Traverse; verify engine, heat range, gap, and VIN fitment |
— |
$115.00 |
|
| Coil-boot seals or ignition coils only if inspection finds damage Optional |
— |
$35.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Confirm engine and plug fitment
The 2009-2017 Traverse runs the 3.6L V6 (LLT early, LFX from 2012), and the correct plug across all these years is the ACDelco 41-109 iridium — the NGK Laser Iridium OE-equivalent (GM 12622561) — pre-gapped at 0.043 in (1.1 mm). You need six. Good news specific to the Traverse: unlike some transverse V6s, you do not have to remove the intake manifold — the plugs sit directly under their coils once the engine cover is off. Scan for misfire codes (P0300-P0306) and inspect the coil boots for cracks before ordering.
🔧 Mechanic's note — Tom Becker
I've done this job enough times to say it plain: Scan for misfire codes (P0300-P0306) and inspect the coil boots for cracks before ordering.
2
Cool and expose the plugs
Let the 3.6L cool completely; the heads are aluminum and hot threads gall. Disconnect the negative battery cable, then lift off the big plastic engine cover — it pulls straight up off its grommets.
3
Remove coils and clean wells
Remove each coil (connector, bolt, coil) in cylinder order. Rear bank: feed the wobble extension in from the side by feel — coils come out the same way, blind. Before loosening any plug, blow or vacuum each well clean; grit in a plug hole scores the cylinder.
4
Remove and install plugs
Remove each old plug with a 5/8 in (16 mm) spark plug socket with a rubber insert, turning counterclockwise — the insert is what fishes the plug out of the deep well. Compare each old plug's reach and deposits to the new ACDelco 41-109. Verify the 0.043 in gap even on pre-gapped plugs. Thread each new plug in BY HAND for several turns to avoid cross-threading the aluminum head, then tighten to the manufacturer's spec in your owner's manual. Never use an impact for final seating, and skip the anti-seize on these plated threads.
🔧 Mechanic's note — Ray Delgado
I've learned this one the hard way — never use an impact for final seating, and skip the anti-seize on these plated threads.
5
Reconnect and verify
Press each coil firmly onto its plug until it seats, refit the coil bolts, and reconnect every electrical connector until the tabs click — give each a gentle tug-test, since a half-latched rear connector will back off and set a misfire code a week later.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Using the wrong plug or assuming a pre-gapped plug needs no verification
- • Blowing debris into an open cylinder or plug well
- • Cross-threading a plug or tightening it without a torque wrench
- • Overusing anti-seize or dielectric grease on the plug threads
- • Mixing coil connectors or ignoring a misfire after reassembly
