Wrote a file to my 09 cts v a couple days ago just fine. Today I keep getting the x7f code when trying to read or write. From searching around I read could be the battery or a wiring/interference issue. I have since tried another battery, removed all the add on crap I have wired up and nothing has changed. I also rebooted my lap top and updated to the latest version of hpt. Any help is much appreciated.
