Misfire and/or Check Engine Light Due To Failed Ignition Coil on Cadillac Seville STS

An ignition coil may fail causing one of the cylinders to misfire. Each of the two banks of cylinders has its own coil assembly. If one ignition coil fails the coil assembly for the corresponding cylinder bank must be replaced.

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Average mileage: 116,000 (84,500–167,000)
4 model years affected: 2000, 2001, 2002, 2003
13 people reported this problem
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problem details
2001 Cadillac Seville STS 102,000 mi,
mpg dropped 1-2mpg, then rough acceleration, then misfire code replaced suggest replacing spark plug boots USE LOTS of dielectric grease
2003 Cadillac Seville STS 132,000 mi,
check engine light due to coilpacks misfiring
Coolant leak out of cylinder head causing cylinder 2 to only have 40 lbs of compression when cold. Car having difficulty accelerating.
2000 Cadillac Seville STS 167,000 mi,
rear coil went bad replaced it and ive been fine.
2003 Cadillac Seville STS 84,500 mi,
One cyclinder misfires according to the computer diagnostic readout 14,000 times!)It is in the shop now.