Question about 2000 Dodge Caravan
Failed emission test with code P0740
PO740 is a TCC/lockup code.TCC stands for Torque Convertor Clutch.In between the engine and transmission is a torque convertor.Inside the torque convertor is a clutch.This clutch engages to eliminate slippage inside the torque convertor.When a malfunction occurs in the system,which is activated by solenoids,and a computer,a TCC code will set.There is a diagnostic route specifically for that code,to determine if the malfunction is electrical,mechanical,or hydraulic.
Posted on Sep 05, 2008
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This can be caused from as little as a blown fuse or bad ground to a bad valve body in the transmission. I would suggest a transmission shop to further diagnose since there are pressures that need checked and circuits that will need checked with diagnostic equipment. Here is a description and the testing procedure for DTC P0740. Keep in mind that there is a good chance the trans will need rebuilt.
Internal transmission component fault (Input or Reaction shaft) Internal transmission leakage (valve body leaking or seal rings) Converter clutch valve or clutch timing valve is sticking TCC assembly has failed.
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