Hi morrisonjessica,
When the D light blinks, the transmission control system has detected a fault in the system.
If the speedometer is not working, then it is caused by a faulty speed sensor.
If no visible indications are present, get to the nearest Autozone parts outlet and get a free scan done to retrieve the trouble code so we can try to figure out what is wrong.
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Tuesday, December 22nd, 2009 AT 10:15 AM