For a 2017 GMC Terrain, four spark plugs are typically required. Part prices range from a few dollars each for basic copper plugs to about $10–$20 each for premium iridium plugs, so a full set might be roughly $8–$80 in parts. Including labor, a shop replacement is usually around $150–$300, depending on your location and the plug type chosen.
Engine options and plug count
The 2017 GMC Terrain commonly uses a 2.4-liter Ecotec four-cylinder engine that requires four spark plugs. Some markets or trims may use different engines, so verify your exact engine and the number of plugs before purchasing parts. Knowing the correct type and gap is important to ensure proper performance and fuel efficiency.
Prices you can expect for four plugs
Prices vary by plug type and brand. Here is a general guide for four plugs in the 2017 Terrain.
- Copper core plugs: about $2–$5 each, or $8–$20 for four.
- Platinum plugs: about $5–$12 each, or $20–$48 for four.
- Iridium plugs: about $8–$15+ each, or $32–$60+ for four.
Bottom line: cheaper copper plugs save upfront cost, while platinum and especially iridium plugs cost more but typically last longer and may require less frequent replacement.
Installation costs and other considerations
Beyond the plug price, several factors influence the total cost of replacement. The access in the engine bay and whether ignition coils or related components need attention can affect labor time and expense.
- Labor: roughly 1–2 hours at typical shop rates, around $80–$150 per hour depending on location.
- Ignition coils or coil boots: if worn, replacement can add $60–$120 per coil plus labor; replacing all four can significantly increase the total.
- Additional materials: gaskets, anti-seize compound, or tools may add a small amount to the bill.
Overall, expect total replacement costs to range from about $150 to $300 at a shop for copper or platinum plugs, and higher if iridium plugs are used or if coil work is required.
Where to buy spark plugs
Buying spark plugs involves choosing between OEM (GM/ACDelco) and aftermarket options, as well as where you shop. Prices can vary by retailer and promotions, so it pays to compare.
- Auto parts stores: AutoZone, Advance Auto Parts, O'Reilly, NAPA, etc. These stores often stock both OEM and aftermarket plugs and can offer free or low-cost diagnostics.
- Online retailers: RockAuto, PartsGeek, Amazon, and the like can offer competitive prices and bundles for four plugs.
- GM/ACDelco or other branded OEM distributors: OEM plugs may come with exact heat range and gap spec for your engine, and they’re a reliable choice for longevity.
Before buying, verify your Terrain’s engine code and the exact spark plug type (heat range, thread size, and gap) specified for your vehicle to ensure proper fit and performance.
DIY vs professional service
Replacing spark plugs on a 2017 Terrain is a doable task for DIYers with basic tools and a little mechanical know-how, though some models place plugs in tight spaces. A professional installation guarantees proper torque and gap settings and can be faster if you’re not equipped to handle the job safely.
Summary
In short, a 2017 GMC Terrain typically requires four spark plugs. Part prices range from about $8–$80 for the four plugs, depending on copper, platinum, or iridium options. If you have the work done at a shop, total costs including labor generally run around $150–$300, with higher figures if premium plugs are chosen or coils need replacement. Always confirm the exact engine type and plug specification for your vehicle, compare prices, and decide between DIY or professional installation based on your comfort level and tools available.