Trans light blinking??
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Drivetrain DTC (trouble code), go to autozone and they will read it for free or find a friend that has an Actron or Diablo or Superchip device that can read codes, it has to read more than check engine codes, these are sometimes called chassis or body codes. If I had to bet the farm on a wild guess it is most likely a torque converter code or somthing with a big dollar sign attached. Let us know what it turns out to be.
-Dave
-Dave