How to replace spark plugs on GMC Terrain?

You will find Spark Plugs located threaded into the top (3.6L V6) or the side (3.4L V6) of each Cylinder Head, so remove the air intake duct for a 3.6L V6; otherwise, you can check it out from here! You will need specific tools including spark plug socket, extension, and gap gauge for adjusting the gaps as required. It is recommended not to start until the engine is completely cold. Examine new plugs for defects and adjust their gaps using a gauge whose measurements are provided in the gap specifications section. Carefully bend the side electrode without breaking off any porcelain insulator if required. Avoid scratching these platinum or iridium coatings on these electrodes. If your engine is a 3.6L V 6 take out ignition coils or rather untwist boots and pull them off since in case of having a 3.4 L V 6 engine remove spark plug wires by simply twisting and pulling off boots." Use compressed air around plugs in order to avoid any dirt falling into cylinders."Fit spark plug socket over plug to be removed, turn counterclockwise and then compare against chart supplied showing how engine should run." A thin coat of anti-seize compound should be applied before installing new plugs."Install a new plug into hole, thread it tight with torque wrench / ratchet using short piece rubber hose for assistance". Finally put back ignition coil or set spark plug wire on each other after you have done this process for all remaining spark plugs.

Genuine GMC Terrain Spark Plug

Ignition Spark Plug

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6 Spark Plugs found

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GMC Terrain Spark Plug Assembly, Gasoline Engine Ignition
Part Number: 12681660
$8.81 MSRP: $15.80
You Save: $6.99 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Spark Plug Assembly, Gas Eng Ign; Spark Plug
- Replaces: 12622561
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2017 GMC Terrain | SLE2 SUV, SLT SUV | 6 Cyl 3.0L, 6 Cyl 3.6L
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GMC Terrain Spark Plug Assembly, Gasoline Engine Ignition
Part Number: 12683541
$8.99 MSRP: $16.12
You Save: $7.13 (45%)
ADD TO CART
Product Specifications
- Other Name: Spark Plug Assembly, Gas Eng Ign; Spark Plug
- Replaces: 55490097
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2024 GMC Terrain | 4 DOOR SLE2, 4 DOOR SLE2 , 4 DOOR SLT1, 4 DOOR SLT1 , 4 DOOR SLT2 | 4 Cyl 1.5L
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GMC Terrain Spark Plug Assembly, Gas Eng Ign
Part Number: 12681658
$8.81 MSRP: $15.80
You Save: $6.99 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Spark Plug
- Replaces: 12617309, 12590701, 12620540
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2017 GMC Terrain | SLE1 SUV, SLE2 SUV, SLT SUV | 4 Cyl 2.4L
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GMC Terrain Spark Plug Assembly, Gas Eng Ign
Part Number: 55504354
$9.85 MSRP: $17.66
You Save: $7.81 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Spark Plug
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022 GMC Terrain | 4 DOOR SLE2 , 4 DOOR SLT1 , 4 DOOR SLT2 | 4 Cyl 2.0L
View related parts
GMC Terrain Spark Plug Assembly, Gasoline Engine Ignition
Part Number: 12681659
$8.81 MSRP: $15.80
You Save: $6.99 (45%)
ADD TO CART
Product Specifications
- Other Name: Spark Plug Assembly, Gas Eng Ign; Spark Plug
- Replaces: 12647827, 12626906
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2020 GMC Terrain | 4 DOOR SLE2, 4 DOOR SLT1, 4 DOOR SLT2 | 4 Cyl 2.0L
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GMC Terrain Glow Plug Asm
Part Number: 55596430
$27.60 MSRP: $49.50
You Save: $21.90 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: GLOW PLUG,Glow; Glow Plug
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2019 GMC Terrain | 4 DOOR SLE2, 4 DOOR SLT1 | 4 Cyl 1.6L Diesel

GMC Terrain Spark Plug

The Spark Plug of GMC Terrain vehicles' functions include sparking a fire that helps in the burning of the fuel/air mixture in the vehicle's engine. This component is made up of a central electrode, metal terminal, and ceramic insulator surrounded by a steel casing. The Spark Plugs available in the market usually include copper core, platinum, iridium, and double platinum Spark Plugs that are somewhat durable and performs well as per the applications and the ignition system. The ignition coil transforms the voltage supplied by the battery to high voltage to produce the spark which ignites the air-fuel mixture, Spark Plugs firing at least hundreds of times per minute while the engine is functioning. Correct servicing and replacement of Spark Plugs are crucial because they affect the efficient operation of an engine, and this may cause problems such as failure to ignite the fuel, stalling, and poor fuel economy.

Each OEM GMC Terrain Spark Plug we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

GMC Terrain Spark Plug Parts Questions & Experts Answers

Spark Plug Assembly, Gas Eng Ign
12681658
Q: How to replace spark plugs on GMC Terrain?
A: You will find Spark Plugs located threaded into the top (3.6L V6) or the side (3.4L V6) of each Cylinder Head, so remove the air intake duct for a 3.6L V6; otherwise, you can check it out from here! You will need specific tools including spark plug socket, extension, and gap gauge for adjusting the gaps as required. It is recommended not to start until the engine is completely cold. Examine new plugs for defects and adjust their gaps using a gauge whose measurements are provided in the gap specifications section. Carefully bend the side electrode without breaking off any porcelain insulator if required. Avoid scratching these platinum or iridium coatings on these electrodes. If your engine is a 3.6L V 6 take out ignition coils or rather untwist boots and pull them off since in case of having a 3.4 L V 6 engine remove spark plug wires by simply twisting and pulling off boots." Use compressed air around plugs in order to avoid any dirt falling into cylinders."Fit spark plug socket over plug to be removed, turn counterclockwise and then compare against chart supplied showing how engine should run." A thin coat of anti-seize compound should be applied before installing new plugs."Install a new plug into hole, thread it tight with torque wrench / ratchet using short piece rubber hose for assistance". Finally put back ignition coil or set spark plug wire on each other after you have done this process for all remaining spark plugs.