I have a superchips vivid linq that I just bought. I have pretty much determined that the tuner is OK but my truck has some issues with tuning. My truck is a 2004 Silverado 2500HD with the LB7 Duramax. The tuner won't read that the ignition is on. I keep getting an error code stating "error verify the ignition is on" even though it's in the run position. I was told by superchips to plug the tuner into my other vehicle which is a 2002 Yukon Denali and verify that the tuner was communicating properly. It was, and I was able to get to the opening screen fine. So the tuner seems to be working like it should. I was able to compare the OBD II connectors to eachother, they are both GM with the same 4 pins. Pin #16 has the same constant power, and with the key on pin #2 has under 1 volt. Both of the grounds, which are the only other wires going to the port are both working as I used them to test for power at pin #2 and #16. All the fuses that would be an issue with a power drain were pulled and the truck is on a charger at 14 volts. Superchips tech has ran out of ideas. Any thoughts?