Question about 1999 BMW 328 Series

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Torque Converter Clutch Circuit/Open

I have a 1999 BMW 328 I and the Code reader reads: P0740
(Torque Converter Clutch Circuit/Open) . Has anyone ever encounter this code on their BMW and if so what was the extent of repair that was done or had to be done ?

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  • bgrobe7 Oct 31, 2008

    Yes, unfortunately. My Engine Warning Light came on about a year ago, then intermittently went off, then on over a period of months. Icould not feel any problem when driving the car; finally, I had an expert read the code and he said I had to replace the torque cionverter, which means pulling the transmission...labor, etc. Over $1,000 so I have been lookin for a rebuilt converter, about 350 my service station man says. With warning light off now, I don't know if I should buy it and have labor done. Anybody help? What happens ultimately if I don't do this repair?

    Thanks.



    Bruce

  • Anonymous Mar 24, 2014

    bmw e46 325i torque converter

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Hello there

The problem is with the gear oil. To keep ahead of the rest BMW started what they call life time oil for their gear boxes, though that sounds great it doesn't really work in reality, they have now gone back to recommending a gear oil change every 60k miles.

In short you need to change your gear oil and soon, the oil in your gear box is no longer effective and will damage the gear box. You'll need about 5 litres for your car and costs around £15 a litre, expensive stuff!! I had the same problem with my 328i auto, the dealer was clueless and kept quoting the lifetime oil, I changed the oil and the problem has gone and it's so much smoother.

Hope this helps, please don't forget to rate me.

Posted on May 20, 2009

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2 Answers

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.

Jun 04, 2015 | Cars & Trucks

1 Answer

Po7400


for P0740 it is:
OBD-2 P0740 - Torque Converter Clutch Circuit/Open
OBD 2 net 24048029-pmx1u32kwnqlluv3tiqttm5t-1-0.jpg TCC malfunciton P0740 OBD II Code

Apr 08, 2014 | 1997 BMW Z3 Roadster

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P0740 honda odyssey


P0740 Honda - Transmission Lock-Up Control System Fault Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection

Tech notes
On some Honda vehicles the P0740 code may be set by an overheating torque converter problem which is caused by an insufficient flow to the torque converter release circuit.

P0740 Honda 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.

Dec 04, 2013 | 2000 Honda Accord

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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

1 Answer

Trouble code 740


P0740 - Torque Converter Clutch Malfunction
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

Sep 11, 2012 | 1996 Buick LeSabre

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

Got this code p0740, tcc circuit malfunction, I would like to replace a TCC Solenoid how do i go about it?


P0740 - Torque Converter Clutch Circuit Open

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

Check your fluids 1st if they are low add fluid, and if they are dirty do a flush and a new filter. This usually will take care of it and save you money. TCCSV is a bit pricey try the cheaper route first. But it is located inside the transmission or on the side of the transmission. I dont recall exactly. Its something I would let a shop do though unless you have high mechanical skills.

Jan 13, 2011 | 2000 BMW 3 Series

2 Answers

P0740 code showing in my 2000 Honda Odyssey


P0740 Torque Converter Clutch Circuit Malfunction
The problem could be the torque converter itself or the sensor circuit for the clutch.
Best to have a Transmission Expert look at it to see if any further damage has occurred.

Apr 19, 2009 | 1999 Honda Odyssey

3 Answers

P0740


torque converter lock-up solenoids are at the top of the transmission on the OUTSIDE. The two came off with three bolts and the screens on mine were clogged with "lint".

Apr 11, 2009 | 1999 Acura CL

1 Answer

2001 tj code p0740


That is the torque converter clutch circuit. Have the torque converter switch and/or relay switch checked, or torque converter lock up switch.

Mar 24, 2009 | 2001 Jeep Wrangler

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