Question about 2001 Buick LeSabre

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Will a bad torque converter clutch lock-up soenoid make the car shake when it shifts into overdrive?? i tryied changing plugs and wires and this is the only other thing that i can think of??

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Posted on Jan 02, 2017

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SOURCE: car lacks power i have changed plugs wired and pcv no vac leaks

It's worthwile to have the car put on a diagnostic machine that checks the computer. I think I rented one of these cars, and it's a fine ride.

Posted on May 05, 2009

  • 3113 Answers

SOURCE: doesn' shift right between 1st and 2 gears it

You need to replace the pressure solenoid in the transmission.

Posted on Oct 09, 2009

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SOURCE: car idles rough in park also runs rough in overdrive

Sometimes a rough idle like that is a fuel filter. As you've already done the plugs and wires the fuel filter would be my next bet.

Posted on Mar 15, 2010

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SOURCE: 98 Buick Park, 95K, shakes between 40-55, ok at

I have a '97 Park Avenue and had the same problem after having 4 new Bridgestone RE-910's put on by Costco. Took it to my indie tire specialist, and he rebalanced all four using his Hunter 9000 (IIRC) that does 'road force balancing'. That's what you need - Costco, and many others, use Hunter balancers but don't have the high-end models that do road force balancing. That improved things somewhat, but not enough. Turns out that 2 of the new tires themselves could not be balanced, and I ended up going through at least four more new tires from Costco before ending up with 2 more that could be balanced perfectly.

There is actually a Buick factory TSB on this very common vibration complaint with the '97 Park Avenue, and I assume it would also apply to the '98. Apparently this car is just unusually sensitive to even the slightest out-of-balance situation, and that causes the vibration. The solution in the TSB is exactly what I had already discovered: Road force balancing is essential, and you must also find four perfect tires that have zero run-out. Have your tire guy look up the TSB as proof, and then make him keep mounting new tires until he ends up with four that can be perfectly road force balanced with the Hunter.

It's frustrating, but once you get everything perfect, the car will be smooth as silk at any speed. I'm about to face the issue again, since I'm about due for another set of new tires!

Hope this helps...

Posted on Mar 28, 2010

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SOURCE: my car can't be driven untill it warms up &

May just be a coolant sensor.

Posted on Feb 09, 2011

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2004 ford crown victoria automatic transmission overdrive lights blinking on overdrive reading codes po743 an po760

P0743 Torque Converter Clutch Circuit Electrical
P0760 Shift Solenoid C Malfunction

Sep 04, 2015 | Ford Cars & Trucks

1 Answer

The Transmission shifts very hard after the first shift. Check engine light is on as well as the Green overdrive light blinks off and on. Speed sensor was cleaned and even replaced.

Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.

Mar 10, 2015 | 1997 Ford Thunderbird LX

1 Answer

My 1997 Mercury Grand Marquis transmission location of the torque converter lock up sensor

There is no part called the lockup sensor, the lock up occurs when the Vehicle speed sensor sends a signal to the Transmission control module that the truck has reached the minimum speed and throttle angle for lock up to take place, it then activates a switch inside the transmission that locks up the torque converter clutch.

Nov 02, 2012 | Cars & Trucks

1 Answer

1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...

P0740 JEEP - Torque Converter Clutch Circuit
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Mar 27, 2011 | 1998 Jeep Cherokee 4WD

2 Answers

1996 Dodge ram 2500 4x4 5.9 cummins Shifts in and out of overdrive in cold weather at lower speeds.

This mainly is caused by transmission fluid level changes. Measure it when its at running temperature and in park. Add if necessary (most likely the cause)

Jan 06, 2011 | 1996 Dodge Ram

1 Answer

Engine starts but then when i go to stop the car shakes and dies. could i took it to the shop and they said they fixed it but never did.

Could be the torque converter in the transmission is locked. If it is, then it would be like stopping with a manual transmission and not pushing in the clutch. You can disconnect the wire harness that plugs into the transmission, this will put shifting into a manual mode. Take it for a test drive, shifting the transmission manually. If your problem has gone away, then the lockup torque converter solenoid is bad. If the problem is still there, then the torque converter will need to be replaced. What did the shop do to the transmission when they supposedly fixed it?

Dec 17, 2010 | 1994 Toyota Camry

1 Answer

Wont shift into overdrive

Good chance that your TCC (Torque Converter Clutch Solenoid) has gone bad and will need to be replaced. Go to Auto Zone and have them scan the van for the DTC codes, I think the DTC code will be P0740. I looked this up and it's "Torque Converter Clutch lockup"

To check for Converter Clutch lock up, when you are going down the highway about 55 MPH, tap the brake pedal with your lefty foot just enough to make the brake lights come on but not enough to apply the brakes as you keep the gas peddle at the same position. You should get/feel about a 300 RPM rise in the engine. If you don't, then the clutch didn't lock up.

Good luck and thank you for using fixya.

Sep 08, 2010 | 2001 Chrysler Town & Country

1 Answer

My 350c will not shift into overdrive all other gears seem to shift fine.

This is not an"overdrive" transmission,but it does have a locking torque converter.That makes it feel like fourth shift at times. Now for the problem:the converter clutch is powered thru the brake switch to a vacuum sensor (on the firewall about 11o'clock behind the brake booster) then to the trans.Check the vacuum hose to the sensor,they get dry and crack up there and near the carb.
You can verify the function of your lock up by jumping the wires at the sensor,but it will lock as soon as you hit 3rd gear regardless of speed.If you tap the brake pedal it should unlock briefly,then re engage.Good luck

Mar 29, 2010 | 1984 GMC C1500

1 Answer

In overdrive it feels like my torque converter isnt locking in. Any suggestions? It is an 02 silverado and normal rpm at 70 mph is 2000 and now its running at 2300

It is possible your lock up torque convertor has a bad connection or wire.
You should be getting a check engine light on in your dash.
You will need a OBD II reader plugged in to retrieve code.
Please let me know.

Feb 09, 2010 | 1999 Chevrolet Silverado 1500

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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