Hi carpro_trex_eater,
Thank you for the donation.
The cost of repairs would depend on what needs to be replaced, solenoids or transmission itself.
Here are the diagnostic procedures.
DTC P0740: Problem in Lock-up Control System
NOTE:
"Â Keep replacement control solenoid valves on hand:
à † Lock-up control solenoid valve assembly (lock-up control solenoid valve/shift control solenoid valve A assembly).
à † A/T clutch pressure control solenoid valve A/B assembly.
1. Check whether the scan tool or the HDS indicates another code.
Does the scan tool or the HDS indicate another code?
YES: - Perform the Troubleshooting Flowchart for the indicated Code(s). Recheck for code P0740 after troubleshooting.
NO: - Go to step 2.
NOTE:
Do not continue with this troubleshooting until the causes of any other DTCs have been corrected.
2. Measure the line pressure
Is the line pressure within the service limit?
YES: - Go to step 3.
NO: - Replace the transmission.
Replace the Lock-up Control Solenoid Assembly set (lock-up control solenoid valve/shift control solenoid valve Assembly and the A/T clutch pressure control solenoid valve A/B assembly.
4. Clear the DTC with the scan tool or the HDS.
5. Using the scan tool, check to be sure that the engine coolant temperature is 176 ° F (80 ° C) or above.
6. Drive the vehicle under the same conditions as those indicated by the freeze data for more than 1 minute, or drive the vehicle at 55 mph (88 km/h) with TPS voltage 0.8 V for more than 1 minute.
7. Recheck for code P0740.
Does the scan tool or the HDS indicate code P0740?
YES: - Inspect the O-ring on the torque converter. If the O-ring is missing, replace the O-ring. If the O-ring is damaged or OK, replace the transmission and torque converter.
NO: - The system is OK at this time.
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Friday, October 29th, 2010 AT 12:18 PM