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

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: 104,270 (44,000–160,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
19 people reported this problem
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problem details
2003 Cadillac DeVille DTS 90,000 mi,
Car idles rough and check engine light is on and sometimes flashes. Worse when engine warms up but idles rough even when cold. Diagnostic check shows P0300 and 303 codes which indicates a misfiring in the #3 cylinder. I haven't troubleshot it any further. I don't want to drive it as it could do damage to the catylitic converter when the check engine light flashes.
2003 Cadillac DeVille DTS 105,000 mi,
I'm having that same issue now, i was told by a mechanic that's it's the 6th cylinder that's having the issue.. My question is, is this bank of coils in a reasonable spot to work on.. I've fixed my door actuator n Chg oil, etc, but I'm kinda nervous bout messing the Northstar, any help would b greatly appreciated.. If it's not to difficult, I'd like to try rather than pay 620 to get it fixed
2004 Cadillac DeVille DTS 130,352 mi,
My vehicle was doing fine. I started it up one morning, and the check egine light came on,along with misfire and vibration. the diagnosis is misfire in # 4 cylinder. I am parking it until it can be repaired.
2003 Cadillac DeVille DTS 98,000 mi,
Replaced front and back coil and plugs
AT IDLE CAR SHAKING SEEMS LIKE MISFIRE COULD IT BE RUBBER BOOT BETWEEN THROTTLE BODY ? OR DO YOU THINK IT'S DEFFENTLY IGNITION COIL ON ONE OF THE CYLINDERS .
2001 Cadillac DeVille DTS 102,000 mi,
Ignition coils misfire. Smell rotten eggs (Unburned Fuel)Need to replace ignition coils and catalytic converter.
2003 Cadillac DeVille DTS 160,000 mi,
Bad back ignition coil
2004 Cadillac DeVille DTS 106,000 mi,
replaced the ignition coil with a new one from amazon.com. Cheapest prices around.
2004 Cadillac DeVille DTS 98,500 mi,
Problem started around 98000 mi. Green Chevy/Cadillac diagnosed and repaired the problem quickly
2002 Cadillac DeVille DTS 82,347 mi,
misfire on one clyder
2003 Cadillac DeVille DTS 44,000 mi,
Clinder 3 coil missfire again! 3rd times a charm..