Question about 1999 Cadillac DeVille
My service engine light comes back Torque converter solenoid system stuck off. Seems to drive fine. Shifts into all gears...Just tired of looking at the light for the past year... any ideas how to fix this problem??? i have 145k miles....Torque converter was stuck on off. I had to pay $4000 to have it fixed. I had been using this Cadillas service shop for 20+ years. I was told this is a problem with other Cadillacs and 5 came in the shop that week for the same service. When I took it in for service two weeks earlier, there wasn't a problem with this. Should I be suspicious? What should I do or what questions should I ask since this was already fixed?
Fast Check on the Torque Converter Solenoid, Cruising at 40-45 mph give a pinch of accelerator 5mph & Back off to 38 if you Feel A BUMP in Trans as if it were Shifting (you may have to do this a Couple of times to feel it) then TCS is Opperating properly, Also as long as it has Been Serviced Regularly Auto Transmissions By GM of this size have a Very clean Record In my 28 years as a Tech/Mech
Take Your Cadillac to another dealer and Dont Mention your Visit with Previous Dealer nor your Suspitions, tell them about the Service Engine Light and that you notice NO Problems that you would like to Know what it is and to CLEAR the CODES and see if it comes Back, After that I Can Say I have seen Some SE lights on For No Reason at all The Vehicles where in perfect Condision. Owners Knew it and I guess Put up with it, I personaly can say it Would drive me nuts. but I Would NOT Spend $4,000.00 or $400.00 to make it go out My thought is Someone is trying to smooth you out of BIG Money. Some cannot be trusted.
IN SHORT YES BE VERY SUSPICIOUS
And yes It can be "TAMPERED"with to Illuminate the Service Engine Light
Posted on Jan 26, 2009
There is a solenoid switch that locks up your torque converter to get a 1:1 input for your transmission. This solenoid (or less likely its circuit) does not operate. You probably don't feel the difference in driveability but this definitely affects fuel mileage of the car.
HERE is a guide on deBugging the problem.
But the only thing this affects is fuel mileage, and is not really worth the investment IMHO. The Check Engine Light may bug you, but its nothing a piece of black electrical tape cant hide :)
Were there any codes you got from the mechanic? If not, zip up to a murrays, autozone, or other parts store in your area, and they will read the codes for free.
Re-post here and we can further troubleshoot.
Thanks for using Fix-Ya - A Fixya rating is appreciated!!
Posted on Jan 26, 2009
Welcome to Fixya! Since this has already been Repaired Once, I would take it back to the Same Mechanic and Find out exactly what he did. He should have fixed this and it should not have come Back on. This is not an Easy repair and I would think that he would Proraye the Repair Price accordingly.
Posted on Jan 26, 2009
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Posted on Jan 02, 2017
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Inspect the transmission fluid for debris.
DTC P0742 Torque Converter Clutch System Stuck ON Step
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check
Install the Scan Tool .
With the engine OFF, turn the ignition switch to the RUN position.
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Record the DTC Freeze Frame and Failure Records, then clear the DTC.
Start and run the vehicle.
Select TCC Slip Speed on the scan tool.
With the transmission in D4, drive the vehicle through the 1-2 upshift.
In second gear is the TCC Slip Speed within the range specified?
-20 to +50 RPM
Go to Step 3
Go to Diagnostic Aids
Inspect for the following conditions:
The TCC apply valve stuck ON because of sediment or damage.
The TCC Sol. Valve Assy. stuck ON because of sediment or damage. Refer to Control Valve Body Assembly Inspection, in Unit Repair.
Was a condition found and corrected?
Go to Step 4
In order to verify your repair, perform the following procedure:
Using the scan tool, clear DTCs.
Operate the vehicle under the following conditions:
• The gear range is D2, D3 or D4.
• The commanded gear is not 1st.
• The engine speed is greater than 500 RPM for 5 seconds.
• Not in fuel shut off.
• The engine torque is 95-270 N·m (70-200 lb ft).
• The throttle position is 14-50%.
• The PCM commands the TCC OFF.
• The TCC slip speed is 150-2000 RPM for 5 seconds.
• The engine speed is 800-4000 RPM.
• The vehicle speed is 32-112 km/h (20-70 mph).
• The speed ratio is 0.65-1.18.
• The last gear change occurred more than 3 seconds ago.
Select Specific DTC. Enter DTC P0742.
Has the test run and passed?
Begin the diagnosis again. Go to Step 1
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