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Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.Your overdrive light comes on when the system sees a transmission fault and when this happens the computer system will detect it and set and store a fault code and or codes. In order to determine the cause you are going to need to start first with having the system scanned to retrieve the fault code and or codes. If you can get this done and post back with them, I can advise you from there as to the correct repair.