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l82vette79 08-23-2010, 06:48 AM I have tuned two lbz's with efi live so far with no problems. I went to tune a LLY and it would not let me do a calibration flash or a full flash it kept on saying unable to communicate with ecm. It would start to go then after getting about 0 percent it would throw up a error message. But I was able to reprogram the truck with the superchips cortex after I gave up on the EFI. any ideas? rpidelt 08-23-2010, 08:15 AM What year LLY? Only the 04.5 and 05 are considered LLY by EFILIVE, the 06 LLY is considered a LBZ. You can also try connecting and properly disconnecting with the Scan Tool. I've forgotten to properly disconnect before and it wouldn't allow me to download until I went back online with it and then disconnected (by actually clicking the "disconnect" button not just closing the program). EFI Support 08-23-2010, 07:08 PM Please post the exact error message, and what software versions you are running. Cheers Cindy | ||