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Might be an input or output sensor going bad. Only Hyundai dealerships are generaly going to have the computer needed to read what is wrong from your transmission computer.
 
Originally posted by: CrackRabbit
Might be an input or output sensor going bad. Only Hyundai dealerships are generaly going to have the computer needed to read what is wrong from your transmission computer.

you can't use a standard obd II reader?
 
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