Quote Originally Posted by idrivem5 View Post
Well... I ran the error code check as described, short #8 to #4, and got 12 on the check light? Doesn't that mean there is nothing wrong?

I disconnected the blue/white wire connector above the diff... not wet. Blew it with canned air and reconnected.

Checked the tire pressure all are within 1lb.

But when I drive, the truck feels like it is missing some power and the TOD lights start blinking after a few miles?

Any ideas?
check all of your fluids too.. water in one of the differentials or in the transfer case could give you some odd issues too