That is a warning system to tell you that the Transmission Control Module has recognized a malfunction and stored a trouble code to identify it. You will need a professional scan tool, not just a generic code reader to retrieve the codes.
Feb 9, 2011 at 5:29 PM
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Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.