Ignition Coils Failure Problems of Cadillac CTS

Tl-the contact owns a 2007 Cadillac Cts. The contact stated that the abs, traction and check engine warning lights illuminated. The dealer diagnosed that the cylinder misfired and the ignition coil was shortened and needed to be replaced. The vehicle was repaired. The vehicle had been repaired for the repairs on numerous occasions. However, the failure persisted. The manufacturer was notified of the failure. The approximate failure mileage was 92,000. Ne.

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2009 Cadillac Cts. Consumer writes in regards to vehicle vibration/unexpected loss of power and transmission shifting and acceleration problems. The consumer stated the vehicle began shifting gears erratically, vibrating and lacked power. The condition appeared irregular and for some time, no trouble light appeared. Once a light finally appeared, the vehicle was taken to a Cadillac dealer who determined that all the ignition coils on one side of the engine were defective. The service representative explained that when one or more ignition coils fail, the engine would have a greater vibration and lack of power. In addition, the coil failure would cause the transmission to unexpectedly downshift to compensate for the loss of power and with multiple coil failures it may shift multiple times each time more power was needed to maintain the throttle speed. In July 2013, the consumer began experiencing the same performance issues. Again, no trouble light appeared. A trip to the dealer resulted in nothing being found, despite the service history of the vehicle. The condition continued and in August 2013. The trouble light appeared. The dealer found an ignition coil on the other side of the engine was defective.

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While traveling at moderate speed vehicle began shaking violently and loosing power. The engine was missing on one or more cylinders. Dealer recommended replacing coil, sparkplug, valve cover gaskets and oil cooler. This seems to have been caused by a defect mentioned in cad Cts TSB id # 1609265 dated 2005. This TSB states that the crankcase vapors and engine oil will vent through the cam/valve cover seals when the crankcase ventilation system becomes blocked. The oil on this vehicle evidently vented and leaked several places including into the ignition coils causing a short. If this had happened in interstate traffic at high speeds this could have caused an accident or if the oil had leaked on very hot surfaces possibly a fire. The TSB specified kits that were to be installed to prevented this from happening. Evidently, these were never installed on this vehicle.

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