The tcc solenoid is located under the side cover of the transmission. The transmission must be partially lowered from the vehicle to remove the side cover. This code most often sets because of wear in the transmission, which does not allow the tcc apply circuit to seal properly. If this problem is caused by wear of the internal parts, removal and disassembly of the transmission is required. I have included below a technical service bulletin that describes this problem and the fix.
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)
Models: 1998-2002 Cadillac Eldorado1998-2004 Cadillac Seville1999-2004 Cadillac DeVille2000-2003 Oldsmobile AuroraEquipped With 4T80-E Automatic Transaxle RPO MH1
Supercede: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.
Follow the diagnostic and repair procedure below to repair this condition: