Conditions for Setting the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

One of the following conditions exist:

The engine is OFF, and the GEN F-Terminal Signal is greater than 65 percent for 15 seconds.
The engine is running, and the GEN F-Terminal Signal is less than 5 percent for 30 seconds.