B0091 05

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.

The front end sensor has been shorted to voltage.
The front end sensor circuit is open.
The front end sensor current has been above 23 mA for longer than 5 milliseconds.
The SDM has not received a message from the front end sensor for more than 375 milliseconds.