Seville STS

Check Engine Light due to TCC fault on Cadillac Seville STS

Problem Description and Possible Solution

The torque converter clutch (TTC) may stop working due to an internal transmission failure. The Check Engine Light will illuminate if this occurs. Our technicians tell us the transmission will require dis-assembly to correct this concern.

Problem Data
RepairPal Verified
Average mileage: 102,142 (64,000–130,000)
5 model years affected: 1995, 2000, 2001, 2002, more2003
20 people reported this problem
Viewing 1 - 10 of 10 comments
Check Engine Light was on when I bought the car, Had Autozone check it and it read P0741 and P1860, Tork Converter !!! Not sure what to do at this point !

I have driven the car for almost 10,000 miles so far and have had No problems with the Trans, Should I still be concerned ? Is it possible its something else causing this check engine light to stay on ? Maybe a sensor ??
tcc code came on due to transmission problem...Have not fixed that cadillac cant make a better product thats so expensive to fix
Also had TCC fault. Had service manual and was attempting to do a test on the 6-8 wire round electrical connector to the transmission. Near top of transmission but not too easy to see or get to. I got connector loose and tried to test, then gave up for awhile and reconnected. But this caused TCC fault to go away! Yes higher gas mileage returned! I think the connector had developed a bad connection on some of the terminals. I took connector off again later and dabbed a little terminal grease on each prong and never had a re-occurrence. This is a good maintenance technique for any connection you work with on an older car.
Check engine light came on and threw codes P0741 & P1860. Since I intend to keep this car for a while longer, I had the transmission replaced $3400
this is such a common problem i wrote a couple reports but it came up under 2000 deville u can read my night mare there u tube has a demo on it that u dont have to drop tranny caddilac knew of these problems but kept it quiet
The car still runs fine with a couple fewer mpg. The problem is it won't pass emissions inspection with a check- engin light on.