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What might cause the overdrive light blink off and on constantly?
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When a transmission malfunction is detected by the Powertrain Control Module (PCM) the overdrive light will flash to alert the driver there is a transmission problem. Diagnostic Trouble Code(s) will be saved in the PCM and can be retrieved by a compatible scan tool. These DTC's will lead the technician to a series of tests to determine the appropriate course of repair.