One problem related to alternator/generator/regulator 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.
Parasitic battery drain. After checking alternator, current while removing fuses, current while in 'sleep' mode, and replacing battery three times the car will run for two days, on the third day it will not crank and the battery is totally dead.