Hey Guys, I've got a 2005 Yukon 4x4. Recently two warnings have appeared: 'Service 4wd' and 'Stability System Disabled'. These started appearing about a month ago, but never got around to getting it into a shop to check it out. Turning the power off and back on usually fixed the warnings until two days ago. Now its constantly on and the lights on the 4x4 console have disappeared. It still felt like it was in 2 wheel high but my wife also said it started strange a few times, revving high before it shifted into 2nd. I have rarely used the 4x4 and even last month after a restart I was able to shift it between 2x and 4x modes. We took it in to a good local shop and they said it was the transfer case and transmission. $500 for transfer and $2200 for transmission. Friend said the 4x4 and transfer electronics on these models sometimes go crazy and it shouldn't be the transmission. We made an appt. with a dealer to get another opinion. Anything I can check on? The only Stability System posts I've found so far also had the low power mode warning, which we never have seen. Thanks!