Four wheel drive vehicles with selectable 4 LO
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The EBCM receives a serial data message from the TCSCM indicating that the VSES mode/transfer case shift control switch is detected as failed. The TCSCM sends this message 60 seconds after the TCSCM sets DTC B2725.