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The Ignition Coil in Cadillac DTS vehicles important duty is to convert the low voltage of the battery into the high voltage required to burn the air/fuel mixture in the cylinders. This component interconnects the primary and secondary circuits of the ignition system; the former comprises battery, ignition switch, and triggering device and the latter, high tension lead, and spark plug cables. Depending on the Cadillac DTS model, it could be a distributor ignition system, or coil-on-plug system or wasted spark system, depending on the make and the kind of function it has. Ignition coils technical issues are generally related to misfires in the engine, lower performance and fuel efficiency are major signs that require regular checkup of the devices.