Second gear is "limp mode" that allows you to drive slowly to a repair shop without needing a tow truck. The Transmission Computer detected a problem. There will be a diagnostic fault code to indicate which circuit or system needs further diagnosis. The Engine Computer fuse SHOULD not be related to the transmission problem, at least not directly. I would start by looking for a wiring harness that fell down onto hot exhaust parts and multiple wires melted and are grounding out.
A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
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Saturday, June 1st, 2013 AT 7:34 PM