Question about 2002 Ford F250 Super Duty SuperCab

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F250 2002 V10 fault code P0743 torque converter clutch circuit

Engine runs rough on and off. Transmission seems to shift hard once in a while.

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  • Anonymous Mar 17, 2014

    torque converter clutch will not up shift

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Hi if the torque coverter is faulty it will not run right as this is what transferes the engines power to the box change it before it damages the box that will be expensive as the metal parts in the coverter will break up and will transfere it through your box if it hasn,t allready done so best of luck yates210456

Posted on Oct 13, 2008

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


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P0743 code ford f250 located at


You need transmission repair.
That P0743 for ford is a diagnostic trouble code is set when the Engine Management Computer (EMC) also known as the Powertrain Control Module (PCM) and also known as the Engine Control Module (ECM) detects a fault with the torque converter clutch (TCC) solenoid electrical circuit, which is contained inside the transmission.

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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)
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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 ?

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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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It also has code po743 and po755


P0743 - Torque Converter Clutch Circuit Electrical
Possible causes- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid
Tech notes This is an electrical problem code. Could be a problem to the harness to the TCC solenoid, the TCC solenoid connector or the TCC solenoid it self.
P0755 - Shift Solenoid B Malfunction
Possible causes- Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid B valve
- Shift solenoid B valve harness or connectors
- Shift solenoid B valve circuit is open or shorted Tech notes When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

Read more: http://engine-codes.com/p0755.html#ixzz27PjeNdA5

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Codes po740, po743 ? po753 all at once. Where should i begin for repairs?


You must do the diagnostics for each code.
Here are the possibilitesP0740 DODGE - Torque Converter Clutch Circuitxicon.jpghttp://engine-codes.com/p0740_dodge.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
P0743 DODGE - Torque Converter Clutch Solenoid Circuitxicon.jpghttp://engine-codes.com/p0743_dodge.htmlForum CodePossible causes- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

P0753 DODGEP0753 DODGE - 3-4 Shift Solenoid Relayxicon.jpghttp://engine-codes.com/p0753_dodge.htmlForum CodePossible causes- Faulty shift solenoid valve
- Shift solenoid valve harness or connectors
- Shift solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

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1998saab 900s po743


P0743: Torque Converter Circuit Electrical

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

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1998 saab 960 s po743


P0743 - Torque Converter Clutch Circuit Electrical
Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes - Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid
Tech notes This is an electrical problem code. Could be a problem to the harness to the TCC solenoid, the TCC solenoid connector or the TCC solenoid it self.

Feb 06, 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
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

2 Answers

P0743


P0743 is torque converter circut electrical. Could mean that the lockup solenoid is faulty or connections are bad.

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