P0740 Honda Odyssey, Autozone game me a "P0740 error code, with a TCC circuit malfunction". I did a 4 quart ATF swap and cleared the code and hoped for the best. I have replaced a failed transmission (3rd gear) a couple of years ago with one that My 2004 Honda Odyssey, 108000 miles, just gave me the PO740 trouble code. The smog check is not passing. We have owned this van for a long time, has about 150k on odometer. P0740 - Torque Converter Clutch Circuit stuck open. Diagnosing . Took it to the dealer today and their diagnosis is a new tranny. Here’s a breakdown of the usual suspects and how P0740 is one of the most common transmission trouble codes. I had a P0740 so I hit the forums.

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