How to replace spark plugs safely and correctly on GMC Terrain?

Begin the replacement of spark plugs only when the engine has cooled enough to protect aluminum cylinder heads. The first step involves taking out ignition coils while you perform cleaning operations on Spark Plug holes. A 5/8 inch Spark Plug socket helps to extract the spark plugs from their locations. The application of anti-seize compound on spark plugs should be avoided while installation to prevent harmful stress on Cylinder Head threads during tightness measurements. Adhere to 1.0 mm (0.040 in) as the prescribed Spark Plug gap setting while torquing plugs to 20 nm (15 lb ft). Finally, reinstall the Ignition Coil(s).

OEM GMC Terrain Spark Plug

Ignition Spark Plug

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5 Spark Plugs found

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GMC Terrain Spark Plug
Part Number: 12683541
$9.41 MSRP: $16.80
You Save: $7.39 (44%)
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Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug,Glow
- Replaces: 55490097
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2023 GMC Terrain | AT4, Denali, SL, SLE, SLT | 4 Cyl 1.5 L GAS
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GMC Terrain Spark Plug
Part Number: 12681660
$9.22 MSRP: $16.46
You Save: $7.24 (44%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug, Spark Ignition; Spark Plug,Glow
- Replaces: 12622561
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2013-2017 GMC Terrain | Denali, SLE, SLT | 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
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GMC Terrain Spark Plug
Part Number: 12681658
$9.22 MSRP: $16.46
You Save: $7.24 (44%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug,Glow
- Replaces: 12617309, 12590701, 12620540
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2017 GMC Terrain | Denali, SL, SLE, SLT | 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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GMC Terrain Spark Plug
Part Number: 12681659
$9.22 MSRP: $16.46
You Save: $7.24 (44%)
ADD TO CART
Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug,Glow
- Replaces: 12647827, 12626906
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2020 GMC Terrain | Denali, SLE, SLT | 4 Cyl 2.0 L GAS
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GMC Terrain Glow Plug
Part Number: 55596430
$28.47 MSRP: $50.84
You Save: $22.37 (44%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Glow Plug, Glow; Diesel Glow Plug; Glow Plug,Glow
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2019 GMC Terrain | SLE, SLT | 4 Cyl 1.6 L DIESEL

GMC Terrain Spark Plug

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GMC Terrain Spark Plug Parts Questions & Experts Answers

Spark Plug
12681658
Q: How to replace spark plugs safely and correctly on GMC Terrain?
A: Begin the replacement of spark plugs only when the engine has cooled enough to protect aluminum cylinder heads. The first step involves taking out Ignition Coils while you perform cleaning operations on Spark Plug holes. A 5/8 inch Spark Plug socket helps to extract the spark plugs from their locations. The application of anti-seize compound on spark plugs should be avoided while installation to prevent harmful stress on Cylinder Head threads during tightness measurements. Adhere to 1.0 mm (0.040 in) as the prescribed Spark Plug gap setting while torquing plugs to 20 nm (15 lb ft). Finally, reinstall the Ignition Coil(s).