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WARNING: This page is about a different car, the 2004 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.
Check for loose cable connections or faulty cable. If cable connections and cable are okay, check voltage at Data Link Connector (DLC) terminal No. 16 (Pink wire). Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses.