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.

codes are OBDll and are available on line free
example P0740 P0740 is a diagnostic trouble code (DTC) for Torque Converter Clutch Circuit Malfunction

https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-torque-converter-clutch-circuit-malfunction-by-andrew-quinn

https://www.repairsmith.com/estimates/trouble-codes/p0740/

The codes translate as:-
P2761 = Torque Converter Clutch Pressure Control Solenoid Control Circuit/Open. P0740 =Torque Converter Clutch Circuit/Open.
Sounds like you might have damaged the wires for the sensors on the clutch for your automatic transmission. Get a good auto electrician to look at it.

Fault codes rarely cause any drivability related symptoms.
P0740 NISSAN - Torque Converter Clutch Solenoid Circuit Fault
Possible causes

• Low transmission fluid level
• Dirty transmission fluid
• Faulty torque converter clutch solenoid valve
• Torque converter clutch solenoid valve harness is open or shorted
• Torque converter clutch solenoid valve circuit poor electrical connection

• P0826 means there is an issue with a circuit for the up and down switch, usually due to a disabled manual shifter or TCM placed in Limo-in mode.
• The presence of a stored code P0725 means that the powertrain control module (PCM) has detected a circuit malfunction with the engine speed sensor input signal. The engine speed input sensor is sometimes called the transmission input speed sensor and the input speed sensor. This type of code may be caused by a mechanical problem or an electrical problem

P0740 OBD II Trouble Code

P0740 Honda - Transmission Lock-Up Control System Fault Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection

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.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

Try reading this, it may answer your question. http://www.delawaretrans.com/2012/11/po740-torque-converter-clutch-circuit.html

P0740 - Torque Converter Clutch Malfunctionhttp://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.

P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible 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?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP 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.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

P0740 - Torque Converter Clutch Circuit Open

Possible 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

Check your fluids 1st if they are low add fluid, and if they are dirty do a flush and a new filter. This usually will take care of it and save you money. TCCSV is a bit pricey try the cheaper route first. But it is located inside the transmission or on the side of the transmission. I dont recall exactly. Its something I would let a shop do though unless you have high mechanical skills.

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.