One problem related to engine shut off without warning 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.
Engine shuts off without warning, sometimes when stopped and/or while moving. This has happened about 4 times in the last year. Suspect a defect ignition switch and/or a crankshaft position sensor.