1998 Honda Civic transmission code P0740 . Transmission slipped once or twice but it hasn't done it since its been raining and its been raining all week it hasn't slipped not one time since it rained.

P0740 means there is a problem with either the torque converter or the control system for the torque converter in your car. It might be such a slight problem that you don't notice anything or it may eventually be totally undriveable. It depends on what part of the system failed and how badly it failed. It can be anything from a simple fluid and filter change (to get debris out of the fluid that might be clogging the solenoid), or it could be an electrical problem (such as the solenoid or wiring) or the torque converter itself has failed (which would mean the entire transmission is likely ruined from the debris). It can be a difficult problem to diagnose--and impossible to diagnose without taking anything apart (or at least test driving it with diagnostic equipment). Start with the basic, and inexpensive, stuff like a fluid and filter change and work your way up from there, as long as the car is still driveable.

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