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Showing results for tags 'P0740 Torque Converter Clutch'.
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1998 Legacy Outback with new rebuilt engine recently installed. I drove it for about 9 months with no trouble codes. Recently, the check engine light goes on while driving at 40mph on freeway. The trouble code is p0740 - Torque Converter Clutch Circuit Open. The check engine light will go out at low rpm's - ie city driving at 25mph. It only goes on when I accelerate on the freeway. The transmission shifts perfectly both in city driving and on the freeway. The rpm at 65mph stays about 3000. I found a used speed sensor that I may install, if necessary, but not sure if it has anything to do with the trouble code - P0740. The tranny is not overheating, the AT indicator light has never gone on. I did notice when the light first went on that my tranny fluid was low - about 2 quarts. I inspected the tranny, hoses, radiator coolant, and found no evidence of leakage anywhere. This is a very perplexing problem which has caused me to limit my long distance driving. Does anyone have suggestions on my problem? Are there other diagnosis procedures that I should consider? Thank in advance for your help.