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

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: 121,121 (8,000–204,442)
7 model years affected: 1997, 2000, 2001, 2002, more2003, 2004, 2005
40 people reported this problem
33 people shared problem details
2002 Cadillac DeVille106,000
'Service engine soon' light is on. It states that 'Cylinder 8 misfire' is the problem. I'm hoping it's something simple like a failed ignition coil on that cylinder or a spark plug...
2000 Cadillac DeVille170,000
misfiring, poor acceleration, runs terrible! Changed coil pack, spark plugs, fixed & replaced o2 sensors and 2nd & 3rd cylinders...still no go!!! Trying fuel pump...not getting any codes!
2001 Cadillac DeVille145,000
Engine shaking occured during normal driving. Check engine light blinking constantly while driving.Replaced both ignition coils corrected the problem. Very costly.
when i go to give it some gas car starts shaking like, it doesnt stall, it feels like a misfire but not sure.
engine at different times starts to misfire runs roughand some time dies. poor accelerationi have replaced the o2senor on front and back exhaust manifolds and also the mass air flow sensor to no improvments.
2002 Cadillac DeVille116,000
had this problem replaced coils and everything was fixed coils are very expensive the labor doesn't cost much the part itself was close to $350 total job cost was $800. recommend replacing spark plug with this coil job
2003 Cadillac DeVille118,000
Dead miss confirmed by OBD II on no 6 cyl. Replaced coil pac.
2002 Cadillac DeVille111,000
replaced both coils
2001 Cadillac DeVille130,110
Front coil pack self destructed at about 126000 miles followed by the rear coil pack at 130000. These Caddys are built like an old AMF Harley...if you like it you will constantly be sinking money into it and working on it every couple of weeks. Typical American car that lasts about 100000 miles (for $50,000) and goes to hell. On another note my Mitsubishi just turned 300000 without ever having an issue and cost 1/3 of my gas guzzling American crap box. Being close to 50YO I have had lot of cars and the Japanese have completely kicked our asses. We have produced nothing but garbage since the 70's. Unless you got tons of spare cash, another car, and lots of patience I would avoid Cadillac and get yourself a Jap car that will last over 200000+ miles.
replaced front three times with aftermarket. recommend against aftermarket their not reliable. Replaced the rear bank and now getting a misfire code on #7
2002 Cadillac DeVille146,000
car shakes and runs rough due to coil packs needing to be replaced.
car runs ruogh check engin light on says misfirer on number three cylinder.also has crankshaft senser bad.
2005 Cadillac DeVille128,000
Is not fixed yet
replaced front module. now i am told the rear needs to be replaced also
2004 Cadillac DeVille150,000
Misfire on cylinder 5
service engine soon light flashing had it checked said it was #4 cylinder misfire
2002 Cadillac DeVille150,000
sputtering, check engine light blinking on and off, Belle Tire states misfiring of cylinders one and two. $800
2005 Cadillac DeVille186,000
I have had to have the head gasket replaced and two coils. It skips, sputters and the check engine light blinks when it misfires. Also, replaced two O2 sensors. But it still rides and runs great. Just like anything else, it takes a little up keep but because its a Cadillac, it cost more.
2004 Cadillac DeVille116,000
Mis fire on cylinder # 6 , got the coil pack and need steps to find out where cool pack is located on this 2004 Cadillac deville
i have had that same problem and winded up paying over $600 to replace both coil packs just for parts not to mention the labor. i replaced the front one but the back one was too much to take apart so i took to an mechanic and he said on these cars every 100,000 miles it should be replaced.
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