Diagnostic Aids

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.

Verify that the transmission meets the specifications in the Shift Speed, See Shift Speed Specification table.
Other internal transmission failures may cause more than one shift to occur.
Refer to the Shift Solenoid Valve State and Gear Ratio Specification table.