Hello all, I'm new to the forums. I just purchased a '06 Limited 4WD with 228K miles. As I mentioned on the title, the 4HI, 4LO and the differential lights are continuously blinking. The previous owner never bothered to fix it and it's been like this for at least 5 years now. I took it to a transmission shop to get it scanned. The mechanic said that it's not even communicating with the scanner. He said it could be the TCM. I just wanted to see if anyone else ran into something similar. I've been watching YouTube videos and I've been searching online for answers. I have not looked under the vehicle yet because it's been scorching hot out here in Phoenix. Any help will be greatly appreciated. Thank you!