Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
With a scan tool, verify that DTC U2099 is not present in the BCM.
- If the DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle .