Question about 2000 Chevrolet Impala
Chevy impala 2000 engine light on code PO742 torque converter clutch circuit stuck in on position. car is running rough
I have the same problem, what can i do to fix it?
Posted on Jan 18, 2009
You can try changing the transmission fluid and filter this may free up the TCC solenoid or you might just have to replace the TCC solenoid. When this goes bad you get the problems and issues that you are having. Here is a discussion on the subject that might help you out .... check on recalls for the problem also.
Posted on Jan 04, 2009
It sounds like the transmision modulator if it is equipped with one. Or the vacuum line running to it.
Posted on Jan 04, 2009
Tips for a great answer:
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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Trouble Code: P0742 This should be looked at by a trusted transmission shop in your area to address this problem. This sometimes does require the replacement of the torque converter itself.
Torque Converter Clutch Circuit Stuck On (4T65-E)
TCC PWM solenoid valve for the fluid exhaust is restricted TCC regulated apply valve is stuck in the TCC apply position TCC control valve is stuck in the TCC apply position TCC feed limit valve is stuck (i.e., the TCC feed limit pressure, and the TCC release pressure to be low or nonexistent) Pressure regulator valve is stuck TCC fluid circuits leaking or abnormally low/high line pressure TCC release switch circuit is shorted to ground TSB 00-07-30-007A contains a repair procedure for this code
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