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....
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... The solenoid for your particular application is available for about 60$ Canadian at NAPA auto parts here in Canada. Not too sure about USD$ and labour costs...
Posted on Aug 13, 2008
Where could i get a picture of where the switch is located?
Posted on Apr 14, 2010
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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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