Question about 2000 Dodge Caravan

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Transmission light cod P0740

Failed emission test with code P0740

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  • tarmin8or Jan 11, 2009

    I have codes p0700 and p0740 on my 1999 Caravan Grnd. Sport. It drives fine although I have noticed some hard delayed shifting. Are there serious problems happening or will a trans service including fluid/filter change and adjustments fix the problem????
    Thank you!!!!


  • Anonymous Feb 11, 2009

    My 2002 Town and Country had same codes.....They tried to replace solenoid...Light came back on....needed overhaul...cost 2k! This is a rare outcome, as mechanic said that the solenoid...a 300.00 fix is usually the culprit. My torque convertor clutch was toast! GOOD LUCK!

  • caxcan Mar 07, 2009

    I have a jetta vr6 and it started to have the same problem.I donot know hat to do

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PO740 is a TCC/lockup code.TCC stands for Torque Convertor Clutch.In between the engine and transmission is a torque convertor.Inside the torque convertor is a clutch.This clutch engages to eliminate slippage inside the torque convertor.When a malfunction occurs in the system,which is activated by solenoids,and a computer,a TCC code will set.There is a diagnostic route specifically for that code,to determine if the malfunction is electrical,mechanical,or hydraulic.

Posted on Sep 05, 2008

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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

I ran a scan on my 99 jeep grand Cherokee V-8 4.7 all wheel drive and got 3 codes P0740, P1787, and P1728. Can u help me with this


ever heard of the FSM
factory service manual
all that is there, in one book, shows what they mean and what to do.
transmission errors.
1: check fuses.
2: check levels.
3: SCan it , you did, now look them up.

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

click emissions chapter, the 7xx codes are all transmission errors

740 is TCC lock up failure or trans slips
get a trans guy to diagnose why?
reset them see if all 3 come back
if yes, they are REAL
the chapter under transmission has all the tests
read them and ask questions on any there are not clear.

Feb 23, 2015 | 1996 Jeep Grand Cherokee

1 Answer

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

0700 codes after replacing speed sensors


Hi there:DTC P0700 is a generic warning code that advice about a transmission fault specific code stored there. In this case, your addicional specifi code is P0740.
DTC P0740 - Torque Converter Clutch control circuit (A/T Torque Converter Clutch - No RPM Drop At Lockup)

This can be caused from as little as a blown fuse or bad ground to a bad valve body in the transmission. I would suggest a transmission shop to further diagnose since there are pressures that need checked and circuits that will need checked with diagnostic equipment. Here is a description and the testing procedure for DTC P0740. Keep in mind that there is a good chance the trans will need rebuilt.



Possible Causes:

Internal transmission component fault (Input or Reaction shaft) Internal transmission leakage (valve body leaking or seal rings) Converter clutch valve or clutch timing valve is sticking TCC assembly has failed.



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Jun 08, 2012 | Dodge Grand Caravan Cars & Trucks

2 Answers

I was driving on the interstate when my check engine light came on. The code was PO741. I was told it was not major. Shortly afterwards, the check engine light went off, and my car drive normal. Now 4 days...


P0741 is internal transmission failure the clutches fail along with the torque converter and the transmission will need to be replaced.

Check and follow this procedure from Honda Service News November 2003 TITLE:
A/T DTC P0740, P0741 Repair Tips: Another Look APPLIES TO: All Models

SERVICE TIP: If you're doing a repair for DTC P0740 or P0741 (lock-up control system) on any Honda models with A/T, except Passport, refer to this table first:

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If there is no S/B posted on ISIS for the vehicle you're working on, go to the DTC P0740 or P0741 troubleshooting procedure in the Automatic Transmission section of the appropriate S/M or under DTC Troubleshooting in ISIS. If the procedure recommends replacing the A/T, make sure you have a reman A/T on hand. Remove the original A/T, and look at the condition of the torque converter O-ring. Then follow these tips to ensure a lasting repair.

Missing or cut O-ring . If the O-ring is missing or cut, the ATF can leak internally, causing DTC P0740 or P0741 to set. Replace the O-ring, and reuse the original A/T. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ). If the DTC comes back, install the reman A/T. If the DTC doesn't come back, return the reman A/T to the reman center.

Flattened or deformed O-ring . If the O-ring is flattened or deformed, replace the A/T. The O-ring can get damaged if the ATF pump seizes up and overheats. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ).

O-ring is OK . If the O-ring is round and in good condition, the most likely cause for DTC P0740 or P0741 to set is the A/T, the torque converter, or both. Install the reman A/T. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for 25 seconds ). Before you install the reman A/T, make sure the O-ring on the torque converter is properly installed.


Hope helps.

Jun 24, 2011 | 2004 Honda Accord

1 Answer

I have a Honda 2000 Odyssesy and the maintenance required light comes on and stays on. We recently changed the oil and filter. I do not notice any problems with the runnning of the vehicle. An auto part...


The maint req. light is a mileage counter. It will turn on every 7500 miles after it has been turned off because that is the factory recommended oil change interval. To turn off the light: with key off, push and hold the trip odometer reset button in. While still holding in the button, turn the key to on but not start. Continue holding the button in until the maint. req. light goes out. Turn key to off.

Code P1456: Evaporative Emission (EVAP) Control System leakage.
Code P0740: Transmission lock up control system.

the first code can be caused by a loose or non-factory fuel cap or a leak.
The second code indicates the transmission torque converter lock-up solenoid could be faulty.

Clear the codes and drive normally for several days. See if the Check Engine light comes on again. If so, have the codes read out and prepare for some repairs. If the light stays off, you had intermittent faults which occur from time to time and nothing is probably wrong.

Feb 24, 2011 | 2000 Honda Odyssey

1 Answer

P0740 T Converter Clutch Circuit Malfunction


The transmission fluid could be in need of a change, certain parts in the transmission depend upon clean fluid to move properly, this could cause the pressure sensor to fail and engage the torque converter to lock up at the right time. Timing is counted with the computer and it will flash lights when there is a problem.

Feb 13, 2010 | 2001 Jeep Grand Cherokee

1 Answer

I have a 20001 Odyssey with 70,000. The check engine light and TCS light both came on. The TCS light has since gone out but the check engine remains. I went to an auto parts store and their computer came...


unfortunately it is. Contact your local dealership to see if it may still be covered under a warranty or not.

Customer Concern: The check engine light is on with the trouble code P0740 present. Tests/Procedures: 1. Test drive the vehicle and watch the tachometer. See if the automatic transmission locks up. If unable to see the RPM change, and the Engine Control Module (ECM) is turning on the lockup solenoids, then the problem has to be internal to the transmission. The transmission has an extended warranty from Honda for 7 years or 100,000 miles. Potential Causes: Automatic Transmission
Lock-Up Solenoid
Torque Converter
Tech Tips: TSB #02-062 Diagnostic Codes: P0740

Oct 10, 2009 | 2001 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

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