P0740 code

ASDF

MEMBER
2001 HONDA CIVIC
4 CYL
FWD
AUTOMATIC
155,000 MILES

Hi, I recently had an issue with the Check Engine light coming on.

I took it to a Partsource to get an OBD scan and the computer came back with a 0740 code, which I believe means Torque Converter Clutch circuit.

I didn't notice a difference in the car's performance so I looked it up and read that a change in transmission fluid might solve the issue.

Before I could do that somebody else in the house drove the car and forgot to turn off the headlights which drained the battery. CAA (similar to AAA) came and gave the car a boost but said that once the car is turned off it won't start again because the battery needs to be recharged or something like that.

Well the car did start (numerous times) and now the Check Engine light isn't on anymore. I took it back to Partsource to get another scan and no issues show up on the computer.

Does this mean that the issue is resolved? What should I do? Thanks in advance, any help would be appreciated.

1 Reply

KHLOW2008

MECHANIC
41,815 POSTS

Hi asdf,

When an intermittent problem occured, it could be due to a poor or contaminated connection which is aggravated by external sources such as water.

If the CEL does not show anymore, then there is nothing you need to do except check if the connectors at transmission is in good condition and securely attached.

P0740 = Lockup control system. It would not affect normal driving performances but would incur higher fuel comsumption as the lock up might not be working correctly and you would be travelling at a few hundred rpm higher than when the system is working correctly.