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The code number is different for all Hondas. There should be a credit card
sized piece of plastic with the owner's manual with the number on it.
If not, have your Honda dealer contact HONDA with the vehicle
identification number (vin) to get the code. Write it down and keep it
safe. You'll need it each time the battery is disconnected or you lose
power for some reason. It's the anti-theft component of the sound system.
Some dealers record the number where you can find it, such as inside
the glove box, or inside the trunk overhead. It's a 5 digit number. Good
Code is at the back of the radio. You have to remove the radio and read the number at the back. Look for a five or six-digit code, e.g. something like 14357. Put the radio back in and then use the front number buttons on the radio to enter the code. That's it. I wish that Honda had put the number on the front or somewhere more accessible!
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.
The only way to get the code is giving the serial number off the radio to the loacl Honda dealer. They can then look it up through Honda's radio code database. If you remove the radio yourself, they might not charge to give you the code.