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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
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Experience:  ASE Master Certification. GM World Class Certification
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03 Cadillac Deville 4.6 DTC PO741,P1860 How To Fix

Resolved Question:

2003 cadillac deville 4.6 32 valve. retrieved DTC code PO741 - AND -P1860 PLEASE tell me what these code mean & how do i fix them?
Submitted: 6 years ago.
Category: Cadillac
Expert:  Dave Nova replied 6 years ago.

Hello and thank you for using JustAnswer. My name is XXXXX XXXXX I will do my best to help you with your Cadillac problem.


Are these the only two codes in the system?

Customer: replied 6 years ago.
Expert:  Dave Nova replied 6 years ago.

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.

Customer: replied 6 years ago.
what about the p1860 code?
Expert:  Dave Nova replied 6 years ago.

The P1860 code indicates a short or open in the torque converter clutch solenoid control circuit.


You have two separate problems. The P0741 code must set first because it will not set with the P1860 code present.


You likely have the mechanical failure listed in the bulletin and a bad torque converter clutch solenoid.

Customer: replied 6 years ago.
what if anything can i do to remedy the situation for a little while without going into the transmission? and if i do have no choice but to go in it what is the proceedure!!!!!
Expert:  Dave Nova replied 6 years ago.

The P1860 code can be fixed by replacing the TCC solenoid, this requires removal of the side cover of the transmission. This is still a major job because the side cover must come off. This requires removal of the front suspension cradle.


The P0741 code will require removal and disassembly of the transmission. This is a huge job that requires some specialized tools and equipment.


1.Remove the transaxle from the vehicle. Refer to Transmission Replacement in SI.
2.Remove the torque converter from the transmission.
3.Install the holding fixture to the transaxle. Refer to Holding Fixture Installation, Document ID #513730 in SI.
4.Remove the transaxle side cover, upper valve body and case cover. Refer to Unit Repair Information in SI.


5.Inspect the two case cover seals (34 and 35) for uneven wear patterns.


6.Inspect the two case cover seals (34 and 35) for uneven wear patterns. The wear patterns will be evident by a uneven wear pattern of the inner diameter white seal surface as shown in the two above illustrations.


7.Inspect the two case cover seals (34 and 35) for splits/tears and or flat spots.


8.Inspect the support drive socket (400) for wear on the bearing race.
9.Inspect the case cover (33) for wear or damage due to the drive sprocket bearing spinning in the bore.



-During the tear down inspection, pay particular attention to seals (34, 35, 409 and 412) for wear or damage.
-Seals (34, 35, 409 and 412) are part of Gasket Kit, P/N 24231068, and do not need to be ordered separately.
-Replace the Torque Converter when servicing a vehicle with this condition.
-Flush the transaxle cooler with Transflow cooler flushing tool, J 45096. Refer to Service Bulletins:


-Info - Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096, TransFlow #02-07-30-052
-Transmission Cooling System Service Tool J 45096 - Transflow Information #03-07-30-002.


10.Replace only the necessary internal transaxle components per: the tear down inspection. See the following Parts Information section.
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