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The GMC Yukon Ignition Coil is one of those small parts which are, however, very vital in the vehicle ignition process. In conversion of the low voltage from the battery to high voltage electricity the ignition coil produces the required spark to the fuel in the engine's combustion chamber. It entails a primary and a secondary coil, which is made of insulated copper wire, each being wound on an iron core held in a housing. The primary circuit is related to the battery and charging system and the secondary circuit involves such elements as the high tension lead, distributor cap, and spark plug wires. There has been the distributor ignition systems, Coil on plug systems and the wasted spark systems that have been available in different models of Yukon at different times. A failure of ignition coil causes uneven combustion, that hampers fuel-burn rate, thus resulting into loss of power within the car; as such, this part must be checked and or replaced once in a while.