This was one of the first questions I asked when I joined the SVX club about 10 years ago.
It means "CENTRE DIFF LOCK". It is activated by inserting a fuse and is ONLY used for testing the transmission. It locks the VTD system into a 50:50 front:rear split. You may notice that your transmission binds up on tight corners.
You should not drive the car around with that light on or your transmission will be damaged. Find the fuse in the bottom right corner of the main fuse box and remove it.
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Subaru ECU and TCU Website
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