These problems are normally caused by wear of internal components inside the transmission. Replacing these worn parts is the fix for these issues. I have included a technical service bulletin that outlines the nature of the problem for you.
Please let me know if you need additional information.
Bulletin No.: 04-07-30-034A
Date: October 13, 2009
Subject: Service Engine Soon (SES) Light On, Diagnostic Trouble Code (DTC) P0741, Torque Converter Clutch (TCC) Excessive Slip, Transaxle Chuggle, Slip/Surge (Inspect and/or Replace Various Internal Transaxle Components)
1998-2002 Cadillac Eldorado
1998-2004 Cadillac Seville
1999-2004 Cadillac DeVille
2000-2003 Oldsmobile Aurora
Equipped With 4T80-E Automatic Transaxle RPO MH1
This Bulletin is being revised to update the Parts Information. Please discard Corporate Bulletin Number 04-07-30-034 ( Section - 07 Transmission/Transaxle)
Some customers may comment on the SES light being illuminated and a chuggle or surge being felt when driving at higher speeds.
Technicians may observe on the Tech 2(R), an excessive torque converter clutch (TCC) slip speed and DTC P0741 set as Current or in History.
|-||This condition may be caused by seal damage that allows the TCC apply fluid to leak into the channel plate, causing excessive TCC slippage under certain operating conditions, eventually resulting in a total loss of TCC apply fluid pressure. |
|-||The TCC may have partial apply fluid pressure or no apply fluid pressure. If excessive slip speed is noted on the Tech 2(R) and the condition/cause cannot be corrected by using the DTC P0741 diagnostic information, then worn seals from slippage of the drive sprocket bearing inner race on the drive sprocket are indicated.|