One problem related to battery cable has been reported for the 2003 Cadillac Deville. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Cadillac Deville based on all problems reported for the 2003 Deville.
For the second time in about one month, the engine died and electric power went out (dashboard lights). The car restarted without difficulty when I pulled off the road and put it into park. We received a recall notice on this vehicle in August. After the first incident I carefully checked the battery cables and found nothing wrong. The battery is almost new. After getting the recall notice I checked the operation of the ignition switch and I found that the detent works perfectly. I had turn the key ccw by a large amount to turn off the engine and no amount of jiggling would cause the fault. Two different keys were involved in the two episodes. There is no possibility that my failures are related to weight hanging on the key. Even so I asked the local dealer as well as the gm hotline when they can install the "fixes" and I was told that no parts may be available for months. About two weeks ago a person on the gm hotline promised to find a dealer with parts and call me back but did not do so. I have no confidence that gm will solve my problem with their recall fix, if and when it is executed, and fear that there is another common cause for the many failures that have been reported.