Sometimes the transmission, when driving at slow speed, locks up as if in neutra

'Locks-up' is pretty much opposite of'neutral'??? P0740 , anyhow, is contamination in torque converter lock-up clutch circuit Change fluid with Honda/Acura ATF and drive 'til it goes. Have trans code cleared and see how long before it comes back with same code, you may have a while(20-30K).DON"T use aftermarket fluid at this point and DON'T let anyone talk you into a 'flush'!!!!!!!!!!!