Question about 1999 Cadillac DeVille

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Requires torque convertor lock up solenoid

How do i replace the lock up solenoid on my 1999 cad. devill 4.6 litre4 speed trans

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Here you go this link should help you out. I'd recommend following the directions specified in the chiltons/haynes manual.

click here for directions.

This guide is a general reference to how to change it on a GM FWD vehicle.

hope this helps.


Posted on Jun 20, 2008


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1 Answer

Torque convertor is stuck what can i do

What problem--in detail

I guess your getting a TCC Solenoid code

No fix for a torque converter

The solenoid will be hard to get at in the side cover
with the trans in the sub frame

That is not a job for you at home & no experience

The solenoid could be bad,the trans pump sticking & other

May be time to pull the transaxle & rebuild it

The taurus trans hasn't lasted long in it's 30 some year history

Mar 05, 2014 | 2005 Ford Taurus

2 Answers

1999 tahoe high rpms in 3rd and 4th gear, ok in second

it can also be your torque convertor clutch solenoid
or you 3 to 4 shift solenoid inside transmission

Apr 19, 2013 | 1999 Chevrolet Tahoe

1 Answer

98 jeep codes p0743,p0740

Go here - - and find the AW-4 Service and Diagnostic Manual. Looks like you need to test some solenoids.

P0740 (M)Torq Con Clutch, No RPM Drop at Lockup. Relationship between engineicon1.png and vehicleicon1.png speeds indicated failure of torqueicon1.png convertor clutch lock-up system (TCC/PTU solenoid)
P0743 (M)Torque Converter Clutch Solenoid/ Trans Relay Circuits. An open or shorted condition detected in the torque convertor clutch (part throttle unlock) solenoid control circuit. Shift solenoid C electrical fault - Asin transmissionicon1.png
P0743 (M)Torque Converter Clutch Solenoid/ Trans Relay Circuits. An open or shorted condition detected in the torque convertor part throttle unlock solenoid control circuit (3 or 4-speedicon1.png autoicon1.png. trans. only).__________________
Rather than banning scary looking black semi-automatic sporting firearms, why don't we
identify and treat the nut jobs pulling the triggers, and put the criminals in jail ?

Feb 11, 2013 | 1996 Plymouth Voyager

3 Answers

2001 Jeep Grand Cherokee showing code P0740

first I want you disconnect the battery and Change filters and good oil transmission .and let me know .

Nov 17, 2011 | 2001 Jeep Grand Cherokee

1 Answer

Cars stalls when warms up seems like the transmission locks up the car will ildle stalls when put in gear

2 things to check 1 check to see if your throttle body and plate are free of carbon build up if not clean and try,#2 torque convertor clutch solenoid sticking on and locks the convertor in which will cause stall when you put it in drive that will need the trans side cover to come off and the solenoid checked or replaced.

Jun 06, 2010 | 1990 Chevrolet Cavalier

2 Answers


Torque Converter Clutch. It has to do with the transmission. It could be a small issue such as a trans. fluid and filter change. Or could be the solenoid failing. At worst, the torque converter is shot...transmission failure.

Apr 09, 2010 | 1999 Acura CL

1 Answer

My check engine light was on and the transmission acts like it doesnt wanna shift. i had it scaned to see what codes it was throwin and they said that it was the transmission torque converter stuck on.. Am...

You will need to take it to a shop to have your torque convertor solenoid and circuit checked.The torque convertor solenoid has a ball ans seat in it and the ball gets stuck at times and lets your convertor stay engaged. the solenoid shouldn't be more than 50.00 and about 2-3 hrs labor cost,plus top off trans mission fluid.

Feb 26, 2010 | Chevrolet Cavalier Cars & Trucks

2 Answers

Repair info on OSD Fault Code: PO743

The code is for a TCC (Torque Convertor Clutch) solenoid problem.

Chances are pretty good the problem is the wiring where it goes into the transmission or the TCC solenoid itself which is in the valve body

There was a bulliten released from Ford about three years ago about this code being set after trans overhauls. In Ford's program stratagies, the P07xx codes are for computer detected failures due to mechanical responses. The P17xx code series are computer identified electrical failures. This code you are getting gets set when the computer does not see the what it would expect from Torque Converter lock-up. The most common problem for this (and is even stated in the bulliten I mentioned) has to do with a seal on the input shaft of the trans. The seal either gets damaged when the torque converter is installed or it is accidentally left out during the rebuild. There is not much that you personally can do, but at least you can understand how to best procede.

you will most likely end up removing that cover to inspect the harness that goes to all the solenoids and then to inspect the valve body and the TCC solenoid itself. If you have a multimeter then you could ohm through the harness and even the solenoid. I have found that most of the time this code was produced because of the solenoid itself. But it could be the circuits to it also. There is a big connector an top of the trans that goes into the trans and the internal harness inspect that connector for any corrosion or damaged pins or wires.

TCC solenoid circuit failure during on-board diagnostic.

TCC solenoid circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM drive failure during on-board diagnostic.

Failed ON - engine runs rough/vehicle shudder, engine stalls in DRIVE (2nd, 3rd or 4th) at low idle speeds. (Short circuit).
Failed OFF - torque converter clutch never engages (Open circuit) (MIL on).

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Jan 03, 2010 | 1999 Ford Windstar

1 Answer

Error codes

Her is the definition and a list of possiable causes.

Code P1740-Torque converter clutch did not lock up when the PCM sent the command. Enabling conditions: No engine or transmissions codes are present, vehicle speed was under 70 MPH, TPS was under 33% open. When the PCM commanded the torque converter to lock, no change was detected in engine speed. Blocking action: This code can block the following monitors: none.
Testing: Check torque converter solenoid for proper operation.
Theory of Operation
The Torque Converter Clutch (TCC) Solenoid is used to engage the TCC which improves fuel economy.
When Monitored
The Torque Convertor Clutch (TCC) and Overdrive Clutch (OD) will be tested each time the PCM requests TCC engagement in 3rd gear and OD.
Set Condition
The DTC will set if the expected RPM drop is not achieved while attempting to engage TCC or OD. This indicates a malfunctioning torque convertor or overdrive clutch.
Possible Causes

Sep 25, 2008 | 2005 Dodge Ram 3500

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