P0740 TCC Solenoid Circuit/Open

How difficult is this as a DIY project? Thanks!

Hello, my car has the check engine light turned on and the code is a P0740 (Torque Converter Clutch Circuit Malfuction). I went to a transmission specialist and several repair shops, all said different things. What are the most probable causes of this code? If the transmission has to be replaced, should I rebuild it or install a different transmission? If I do rebuild it, what is a fair price?

The torque converter does not seem to be engaging, once up to temp drive 55 no load for approx 2 miles cel comes on and p0740

I drive a 1999 Honda Civic, automatic transmission, 254,000 miles (yes, you read it right, 254,000). Last April the check engine light came on and I took the car to a mechanic. The code was P0740. I was told I needed a new transmission. I went to the dealer for a second opinion, same recommendation. I was prepared to retire the car, but a friend recommended a mechanic to me, so I gave it one more shot. He, of course, got the same code, but checked the transmission fluid before jumping to conclusions. It was extremely dirty, so he told me it was worth a shot to have that replaced and see what happened (the car was acting completely normal, there was no change in performance during all this). He replaced the fluid (and said there was no metal in it), and the light stayed off for about 1000 miles. I went back to him when it came back on (still no change in performance.) He changed the fluid again, and said you can't get all the fluid out the first time. About 10,000 miles later, the light came on again. I had a friend check the code and it was, once again, P0740. He freaked out and said I needed a new transmission, just like most the other mechanics. He turned off the light, and the next day I took a trip from Pensacola to Ocala and back. No problems, car ran like a dream, no check engine light. The day after I came back the light came on. I just disconnected the battery and reconnected it to turn off the light. It has not come back on (another 300 miles), Car is still running beautifully, I do regular oil changes, check the transmission fluid frequently, and maintain general maintenance. Do you think there is anything to be concerned about, or am I begging for a disaster?

One more thing, I had used the car when I delivered pizzas (about a year and a half. Appx 35,000 of the miles were stop and go pizza delivery). Don't know if that info is related at all.

Good luck cracking this case, and thanks so much!

Hi, I live in ga and im wondering if its safe to drive to florida with a engine check light on that has the code p0740? This is important because my cousins graduation is coming up and I dont have the time to get it fixed right now.

Thank you.

Hi, I keep getting this code ive tried everythnig but an coolant temperature sensor. Could this be malfuncionting and making the lock up control systemn not engage? Please let me know. Thank you.

98 civic, 4dr ex d16y8 automatic 169,000mi. Getting a code p0700/p0740. I believe something about the locking solenoid system (torque converter). I cycled the tranny 4 times with honda fluid. Cleared code and lasted about 45 miles. Replaced lock shift solenoid only. Still getting code. A mechanic cleaned my connectors and it lasted about 30 miles before the code came back on. Should I replace the other two solenoids. Car shifts smoothly. Only bad is I have to drive up a 8 mile hill and the tranny automatically shifts to 3rd the entire road. RPMS are about 4100 @60 mph. Is their anything else I can do before I forego a tranny replacement?

The po700 code just means that there is a transmission problem and the po740 means the transmission converter clutch circuit. But when I drive it and I am really easy when I press the gas pedal down it does not like thud through first and second, but it still takes longer than it should to shift into the next gear. But when I press on the gas pedal like you normally could with any other automatic vehicle it shifts out of first quick kinda with a big thud and the whole car jumps and then it takes longer than it should to shift into third, and when it shifts into third the thud is a little less and then into fourth its a lot less then fifth it takes a little less longer to shift. I am still not exactly sure where it should be and there is no thud at all. I would like to test the solenoid, s but I do not know exactly where there are located. Can somebody give me pointers I want to fix it myself?

Hello, I keep getting p0700 and p0740 there is nothing wrong with the transmission at all. I believe somthing is setting it off. The fluid is fresh. I pulled the freeze data and got

coolant temperature 190 degrees
throttle position 16.8%
engnie rpm 2179
load value 56.8%
map sensor 58kpa
intake air temp 102 degrees

is there anything that looks wrong with this I cant figure this code out.

Thats all at 52mph