Your spark plugs require a much higher voltage than a battery outputs, which is why a 2018 GMC Yukon ignition coil exists to increase this voltage before the current reaches the plug. If your coils are wearing out your Check Engine Light may illuminate, and you could also experience symptoms like lowered fuel efficiency, sluggish acceleration, rough idle, and starting trouble. Check out our selection of replacement 2018 Yukon ignition coils to find the right part at the right price.