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The service engine soon light came on our 02 duramax so i brought it to autozone and 2 codes came up, P0700, and P0743 can anyone tell me what they are, and whats needs to be done to fix the problem. thanks
 

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TCC, torque converter clutch electrical. Need to put a Tech 2 on it and go for a road test and watch if there is any slippage in the converter.
 

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It is a diagnostic tool for GM vehicles, they cost upwards of $3000. Take it to your dealer, they have one and will test it for you.
 

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It could be an electrical problem with the TCC solenoid or circuit.

The p0700 code is a code sent to ECM from the TCM to tell it there is/are codes in the TCM.
 
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