Question about 1997 GMC Jimmy

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I'm getting an intermittent failure P0740. In Over Drive The transmission won't start out in the lowest gear and it won't shift to its highest gear when at higher speeds. Sometimes it works perfect,

I've only check the fluid.

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  • GMC Master
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Sounds like it is time to take it to the service shop, you may only need a new filter, oil and gaskets.

Posted on Dec 11, 2014

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I have been getting the code p0740 it says something about the torque converter clutch circuit. it doesn't seem to be going into over drive. dose anyone have any suggestions I can try.


On some cars, there is a TCC solenoid in the transmission which can be replaced by removing the bottom pan. In some cars this solenoid can't be accessed without major disassembly.

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My 92 cadillac deville shift at 30 miles per hour and again at 60 do you think its my transmission speed sensor


its very possible ,that's where tranny gets info to shift all your main gear shifting should be done by 35 mph and after 55 is overdrive the other is if you take it for a drive and manualy shift it out from lowest gear to highest and see how it functions, so you can feel the shifting advance then try it again just in drive only and see if you can feel the gears shift out , have you serviced tranny ? is it a high millage car it is 23 years old ,

Feb 22, 2015 | Cadillac Cars & Trucks

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Code 0740 andd 0700


P0740 - Torque Converter Clutch Malfunctionxicon.jpghttp://engine-codes.com/p0740.htmlForum CodePossible 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?Diagnostic trouble code P0740 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

P0700 TCM has requested PCM to run on Check engine light to alert to a fault in the automatic transmission.

Oct 02, 2012 | 2003 Volvo V70

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Hey i have a 97 jeep grand chereokee i wen't to the nearest autozone the code came p0740.As im driving the RPM is going to high a low speeds on the highway feel like it down shifting between 3 RPM N...


P0740-TORQUE CONVERTER CLUTCH CONTROL CIRCUIT...

POSSIBLE CAUSES:

RELATED DTC P0750 PRESENT
INTERMITTENT WIRING AND/or CONNECTORS
INCORRECT FLUID LEVEL
INTERNAL TRANSMISSION PROBLEM - TCC OUT OF RANGE
L/R SOLENOID INOPERATIVE

Further diagnostic with a good scan tool will help, could be all you need is a new solenoid or some electrical repairs. Hope this helps.

Jul 06, 2011 | 1997 Jeep Grand Cherokee

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.

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not sure if this is the answer yet but i have the same problem with the same codes i work at an auto parts store and a few of the techs that are customers have lead me in the direction of changing the ignition switch, i am doing it today will let you know if it solves the problem

Jan 01, 2010 | 1997 GMC Jimmy

4 Answers

P0740 code on 2000 Honda Odyssey


Code p0740 is a problem in lock up control solenoid assembly, Check whether scan tool indicates another code. Does the scan tool indicate another code? YES - Perform the Troubleshooting Flowchart for the indicated Code(s). Do not continue with this troubleshooting until the causes of any other DTCs have been corrected. Measure the line pressure. Is the line pressure within the service limit? Repair the hydraulic system as necessary. Replace the Lock-up Control Solenoid Assembly set lock-up control solenoid valve/shift control solenoid valve A assembly and the A/T clutch pressure control solenoid valve A/B assembly. Turn the ignition switch OFF, and reset the PCM memory by removing the BACK UP fuse in the passenger's under-dash fuse/relay box for more than 10 seconds . Using the scan tool, check to be sure that the engine coolant temperature is 176°F (80°C) or above . Drive the vehicle at 55 mph (88 km/h) for more than one minute . Recheck for code P0740. Does the OBD II scan tool indicate code P0740? YES - Remove the torque converter and inspect for a missing torque converter O-ring. If the O-ring is damaged or missing, replace the transmission and torque converter. NO - The system is OK at this time.

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I agree, this is a lot of codes. I would tend to think this would be electrical, perhaps computer are a loose connection? These trannys I have rebuilt so far usually have a couple of codes related to the problem but not this many - all over the place.

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