One problem related to service engine light on has been reported for the 2006 Cadillac DTS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Cadillac DTS based on all problems reported for the 2006 DTS.
We have owned this Cadillac since Feb 2010 (approx 28 months) and have had this vehicle back to the dealer 16 times. Each repair requires a rental vehicle, anywhere from 2-5 days per service visit. We have had 7 wheel bearings replaced and 12 sensors replaced. There doesn't seem to be a day when the service engine light is not on. The quality of this $52,000 automobile is very poor. The vehicle is back at the Cadillac dealer now, with coolant & engine issues once again.