If you over 100,000 miles handa says replace the trans if your under you may be under warranty.
DTC P0740: Problem in Lock-up Control System
As per Honda Service Bulletin 02-062 (January 5, 2007), DTC P0740 testing procedures have been replaced by the following:
Got an A/T DTC 0740? Don't Replace the Solenoids
If you're troubleshooting a '99-04 Odyssey for an A/T DTC P0740 (lock-up control system), don't replace the TCC, shift, or linear A/B solenoids if the A/T has more than 10,000 miles racked up. What's most likely causing this DTC is low line pressure resulting from the inlet screen being clogged with clutch material. To fix this problem, see additional information below, and replace the A/T.
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