I have a 2003 Cadillac CTS 3.2 5 speed .Ive had several issues with my this car sence new. From windows and sunroof opening and closeing on their own, the stability control system always engageing while driveing down the highway jerking the car one way or the other and Im on my 4th battery @$210 a pop.. While these problems still exist my new problem has had the car parked for 8 months. While driving down the highway about 70 the car completly blacked out, car stalled and I managed to get it off the road safely. After sitting on the side of the road for about a half hour, everthing popped back up like nothing had happened. I started the car back up and continued to work. The next day the same thing. The following day was a little different, this time everthing started shutting down one at a time. First was the gas gauge to empty, then the radio amp went out, then the tach and speedo, the windows and door locks then the radio display screen, all which would turn off and on but the car stayed running. I got to work, shut the car off and restarted it and every thing was back to normal. That night i took the car to a cadillac dealer to have it scanned. He told me that there was a loss of communication and codes to all the different modules or computors. He said he had seen this befor and said the ignition switch was faulty causing it to lose power. So he installed the ignition switch cleared the codes and all was fine. I got home, parked it for the night. The next day drove to work everything fine, went to leave work, everything blacked out again, no start. Hasnt started sence. I finely saved up enough money to bring it back to the dealer to have it fixed, it had been there two weeks a they have no clue whats wrong. So they tried a new ECM @$410 and still nothing, everything is still dead.. please help

 

2003 CTS electrical problems
I have a 2003 Cadillac CTS 3.2 5 speed .Ive had several issues with my this car sence new. From windows and sunroof opening and closeing on their own, the stability control system always engageing while driveing down the highway jerking the car one way or the other and Im on my 4th battery @$210 a pop.. While these problems still exist my new problem has had the car parked for 8 months. While driving down the highway about 70 the car completly blacked out, car stalled and I managed to get it off the road safely. After sitting on the side of the road for about a half hour, everthing popped back up like nothing had happened. I started the car back up and continued to work. The next day the same thing. The following day was a little different, this time everthing started shutting down one at a time. First was the gas gauge to empty, then the radio amp went out, then the tach and speedo, the windows and door locks then the radio display screen, all which would turn off and on but the car stayed running. I got to work, shut the car off and restarted it and every thing was back to normal. That night i took the car to a cadillac dealer to have it scanned. He told me that there was a loss of communication and codes to all the different modules or computors. He said he had seen this befor and said the ignition switch was faulty causing it to lose power. So he installed the ignition switch cleared the codes and all was fine. I got home, parked it for the night. The next day drove to work everything fine, went to leave work, everything blacked out again, no start. Hasnt started sence. I finely saved up enough money to bring it back to the dealer to have it fixed, it had been there two weeks a they have no clue whats wrong. So they tried a new ECM @$410 and still nothing, everything is still dead.. please help

 

still nothing,car has been at the dealer for more than a month now. i have no idea what they have tried but nothing is powering up. i seen the car. they have all the seats ripped out the dash and carpet . still no luck

 

found these buried in the wrong place ...

bump .....

 

just wanted to update on my post. the dealer could not find the problem with my car so they told me to pick it up after two months . no charge thank god. i towed it home and began to search the problem once again on my own. i checked and removed every ground every plug. then with the key in the on position. i unhooked the main harness to the dash and the window switch started working. so i plugged it back in and it stopped. so the started searching the main harness for a grounded wire. then i found it. at the back of the motor on the right side where the ecu harness runs to the back of the motor, it runs under a steel coolant pipe and between the motor. the harness was rubbed through in this spot grounding out. i was able to repair the wires and after almost a year of not driving this pos im back on the road again. Ive seen alot of posts on here with simular problems. please keep this to the top..............