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Originally Posted by coggerwayne
I had the same d2 error - could not connect to PCm - finally had to sent back in for replacement - curious to what you did to get in back to normal.The custom tunes are great - totally differnet truck - can't wait till simmer to see how it pulls the boat through the mountains.  
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See post #7. I hooked it to the computer and used the Pegasus software, went to updates, and used the Gryphon software manager to wipe and reload all the firm and software. Pretty easy, but a shot in the dark when I couldn't figure out what else to do.