Circuit Description
WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
At each power-up, the transfer case shift control module will check the boot loader for a valid calibration. If no calibration is found the DTC will be set, this DTC will be erased upon programming.