One problem related to engine exhaust system has been reported for the 2003 Cadillac CTS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Cadillac CTS based on all problems reported for the 2003 CTS.
Driving our 2003 Cts it will shut off without notice. It was put on a machine and nothing showed wrong since 2003. Eventually it shut off and would startup for 45 min (2010) the crank sensor was replaced and 2 weeks later it shut off again. .