bigboyj1 Posted February 28, 2010 Report Share Posted February 28, 2010 I have a 1995 seville sts with codes p029(shift b solinoid problem)p039(torque converter clutch engagement problem)p056(trans input speed sensor)p094(shift a solinoid problem-vehicle speed sensor).At times when shifting from 1st to 2nd it would shift hard. This went on for quit a while.One day while doing about 35mph it went into 1st gear and would not shift at all.This problem is current and the car is parked.I am wondering if replacing these sensors and solinoids will fix it or if the trany needs replaced.The trany never sliped as it would if it had worn out clutch plates.Any help would be apreciated. Link to comment Share on other sites More sharing options...
MAC Posted February 28, 2010 Report Share Posted February 28, 2010 I looks like you need replace both Shift Solenoids. I replaced them in my former '94 Eldorado. It's not a difficult job, just a bit time consuming unless you've done the job before. Here is a link discussing my experience replacing the solenoids. Link to comment Share on other sites More sharing options...
jjangel Posted March 2, 2010 Report Share Posted March 2, 2010 I had to replace the shift Solenoid at around 40,000 miles on my 1995 STS Seville. At 90,000 started having problems with it surging & so I was told needed to replace the trans input speed sensor; while it was in the shop I got a call that I needed to replace the torque converter so I agreed. when I got the car out of the shop & drove it about 5 miles I realized I had bad problems....running really rough, wasn't shifting out right,the shift lever was off ..you had to put the selector in reverse to go forward, needless to say I turned around and took it back. Finally, 3 weeks later I got my car back. Had to order another torque converter the first one was bad when I got my car home from this Cad dealer they tried to double bill me for labor on #2 torque converter I refused to pay & won that one but changed dealers. Transmission has never quite shifted right since then but I haven't had anymore work on it & that has been 7 yrs ago. Getting another transmission code now but it still runs good. This has been my only problem with the car. Now showing some engine wear with oil leaking but I think that is normal for the miles it has on it. Jan Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 2, 2010 Report Share Posted March 2, 2010 I had to replace the shift Solenoid at around 40,000 miles on my 1995 STS Seville. At 90,000 started having problems with it surging & so I was told needed to replace the trans input speed sensor; while it was in the shop I got a call that I needed to replace the torque converter so I agreed. when I got the car out of the shop & drove it about 5 miles I realized I had bad problems....running really rough, wasn't shifting out right,the shift lever was off ..you had to put the selector in reverse to go forward, needless to say I turned around and took it back. Finally, 3 weeks later I got my car back. Had to order another torque converter the first one was bad when I got my car home from this Cad dealer they tried to double bill me for labor on #2 torque converter I refused to pay & won that one but changed dealers. Transmission has never quite shifted right since then but I haven't had anymore work on it & that has been 7 yrs ago. Getting another transmission code now but it still runs good. This has been my only problem with the car. Now showing some engine wear with oil leaking but I think that is normal for the miles it has on it. Jan Describe what you call SURGING. Surging is not caused by the Input Speed Sensor (ISS). Maybe your problem was the torque converter and it needed an ISS. I find it amazing that shops let cars go out without testing them Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
PAUL T Posted March 5, 2010 Report Share Posted March 5, 2010 I have a 1995 seville sts with codes p029(shift b solinoid problem)p039(torque converter clutch engagement problem)p056(trans input speed sensor)p094(shift a solinoid problem-vehicle speed sensor).At times when shifting from 1st to 2nd it would shift hard. This went on for quit a while.One day while doing about 35mph it went into 1st gear and would not shift at all.This problem is current and the car is parked.I am wondering if replacing these sensors and solinoids will fix it or if the trany needs replaced.The trany never sliped as it would if it had worn out clutch plates.Any help would be apreciated. I would start with replaceing the shift solenoids. There is a world of info on here about them. If you can't do it yourself go to a reputable transmission shop that works on Cadillacs. I used a mom & pop shop and got off easy, $75 labor. It will only take the about 1/2 to 1 hour to do. If I remember right when I changed my shift solenoids on my 94 Concours the P056 went away. Make sure all sensor wiring is away from the spark plug wires because it is subject to electromagnetic interference. Link to comment Share on other sites More sharing options...
PAUL T Posted March 5, 2010 Report Share Posted March 5, 2010 jjangel your oil leak might just be from the oil pan bolts loosening up. Next time you have it in for an oil change have them check the oil pan bolts. It could also be a loose oil adapter among other things. Link to comment Share on other sites More sharing options...
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