Question about 2000 Daewoo Nubira

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Engine light comes on, code says torqe converter lockup, doesnt shift right at times

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  • yadayada
    yadayada May 11, 2010

    U need a transmission overhaul.

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  • 7 Answers

Do you have the right amount of oil in the box.With the car running and the box in neutral the dip stick should say full if not you need to add transmission fluid.

Posted on May 13, 2009

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Posted on Jan 02, 2017

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98 jeep codes p0743,p0740


Go here - www.jeepforum.com/forum/f11/tech-faq-links-tsbs-89273/ - 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

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
Symptoms
- 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

1 Answer

1993 cutless cierra, when driving, all is fine, then when you come to a stop sign, or a light, the engine cuts off. It will start immediately, but when you put it into gear, it cuts off. had to have it...


sounds like the lockup converter is not releasing when you stop, like stopping with a stick shift and not pushing in the clutch. lockup solenoid most likely. Could just disconnect the lockup sol. (won't lock up at all) or replace the solenoid.

Mar 17, 2017 | 1993 Oldsmobile Cutlass Ciera

1 Answer

Getting error code P0 740. what does this mean?


In the '96 Factory Service Manual, it says code P0740 is "Torq Conv Clu, No RPM Drop At Lockup" (Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement).

When I lived in a cold climate (MT) had a JGC,V8, with a trailer towing option that didn't shift correctly in cold temps. The problem was corrected with a TSB that bypassed the tranny cooler @ cold temps.

I've seen several cold weather TSBs having to do with Dodge transmissions at the following: http://dodgeram.info/tsb/group_21.htm

Hope helped.

Mar 09, 2010 | 1997 Dodge Ram 1500 Club Cab

3 Answers

1990 Olds 88 Royale; engine stalls


You've got to do the obvious things, look at your spark plug wires, if you see what looks like chalky residue they are arcing replace them and your plugs. Check all vacume lines for leaks, and make sure your air filter is clean

Sep 10, 2009 | 1990 Oldsmobile Eighty Eight

1 Answer

Check engine code P0740 (torque conv clutch no rpm drop at lockup). Reset the check engine light and then took jeep on highway and it shifted through the gears normally and i could here the rpm's drop...


Low fluid pressure to the torque converter Have seen this before. I first try to flush the fluid and replace the filter fixed the problem most of the time. If that doesn't work u need a new torque converter.

Jul 16, 2009 | 1998 Jeep Cherokee

1 Answer

I have a 2000 ford explorer that has the 5r55e tansmission it shifts fine but if I accell it bogs down the motor. the engine light is on and the codes read the torq converter problems and shift soleniod...


How many miles does it have on it? Also has it had trans work before? These transmissions are know for having lots of valve body issues. IF you are light on the throttle it works fine?

Jun 24, 2009 | 2000 Ford Explorer

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