One problem related to steering column has been reported for the 2005 Cadillac Deville. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Cadillac Deville based on all problems reported for the 2005 Deville.
Vehicle cuts off at random times while in motion. The car ignition cuts off all power to the engine and power steering when the car hits a bump, railroad track, or pothole. Bumping the column cover will also cut off the engine, and the power steering. The vehicle has had the key modification which would appear to have no affect on the problem of the ignition randomly rotating out of the on position.