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Cadillac Seville 1993-2003 4T80-E Transmission


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Bruce, that was the thread I was thinking about also by Logan, but I think Logan said the P1860 causes the P0741 code

http://caddyinfo.ipbhost.com/index.php?showtopic=12067

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

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Looking for other Seville Owners who have had problems with the torque converter Lock Solenoid. Giving Diagonostic codes 741 and 1860.

Bill 12

Have mine in transmission shop now, waiting for the bad news. Had a different shop tell me it was common and that the solenoids need replacing. The transmission shifts 1,2,3 but the torque converter won't lock up for 4th gear. They tell me it is "okay" to drive gas millage will drop. Just got back from 300 mile trip still got 27mpg, down from 32.

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  • 3 weeks later...
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I replaced my solenoid, literally, days ago. Yes, it's common. I, among others, can walk you through it if you want to get your hands dirty and save yourself about a thousand dollars. Simple tools, time, patience, and $50 is all that's required.

Do you have to remove the tranny to do this job?

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I replaced my solenoid, literally, days ago. Yes, it's common. I, among others, can walk you through it if you want to get your hands dirty and save yourself about a thousand dollars. Simple tools, time, patience, and $50 is all that's required.

I too have this problem!!! The car runs and shifts fine but the check engine light is on and throwing the code - I for one would love to do this my self but not sure what it in-tells?????

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Do you have to remove the tranny to do this job?

To replac the TCC solenoid, you don't need to remove the transmission but you need to drop the cradle enough to remove the side cover of the trans.

If the problem is worn seals in the turbine shaft assembly which causes the trans fluid not to activate the lockup feature and/or excessive slippage of the torque converter (which heats up the vicous silicone fluid and ruins the torque converter), then the transmission needs to be dropped to R&R the torque converter.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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