Question about 1999 Honda Accord

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My mechanic just installe a rebuilt transmission into a 1999 honda accord 4cly. but he forgot to put the o-ring on the torque converter It runs good now but the check engine light is on Will this cause me any problems

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You need to have the code pulled and see if it references a transmission code,if so then you need to have the mechanic fix the problem as he missed something and it can affect the transmission being damaged.after all you paid to have a job done correctly.if the code is not transmission related you should have it fixed as it can cause a problem else where.

Posted on Mar 30, 2011

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Your best bet is to go to a parts house and buy a rebuilt torque converter. Make sure you save the old one because they will likely require a core.

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P0740 Honda - Transmission Lock-Up Control System Fault Possible causes
- Low transmission fluid level
- Dirty transmission fluid
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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.
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Honda Civic 2005 Check Engine Code P0741 Torque Converter or Stuck Off


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I have a 1997 Honda Accord SE 4 Cylinder with a check engine light on. I had a mechanic run a diagnostic and it came back with code p0740, torque converter clutch circuit malfunction. What does this mean?


The torque converter is a key functional part of the automatic transmission. The car computer detected a malfunction and set the P0704 code. Most likely you have over 100k miles already so it could be problems with the transmission. Most mechanics will reset the light and code if you are not having any transmission problems. It the problem comes back you will need to service or replace the transmission. Best thing to do is to take the car to a mechanic you trust and find the best and cheapest way to address the malfunction.

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1 Answer

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Change the transmission fluid and filter once a year -- no matter what! If you do this, then you should never have any more problems with the transmission.

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1 Answer

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These cars have a lock up torque converter meaning 4 gear going above 35 to 40 MPH, the engine and transmission lock together and turn at the same rate. I know that older GM cars had a plug that needed to be plugged into the transmission for the lock function to work on the torque converter and if you unplugged it the RPM's would run high as you describe. I have never had a 1999 Silhouette and I'm not 100% sure that these cars have that type of plug but it sounds like that type of problem. I agree with you. You know your car and I would take it to a transmission mechanic and describe your problem to them.

Good luck!

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