Code U0110 on the 2023 GMC Sierra indicates lost communication with the shift-by-wire control module. The Sierra uses an electronic shifter that sends gear selection commands over the CAN network rather than using a mechanical linkage to the transmission.
Shift-by-Wire Technology
The 2023 Sierra's shift-by-wire system eliminates the traditional mechanical shift cable. When you move the shifter or press the column-mounted buttons, the shift-by-wire module interprets your selection and sends electronic signals to the transmission control module. This technology enables features like automatic park engagement and remote vehicle movement.
Critical Symptoms
With U0110 active, the transmission may not respond to gear selection requests. The vehicle may be stuck in Park with no way to shift, or stuck in gear with no way to park safely. Warning messages appear on the Driver Information Center, and the gear indicator may show incorrect or no selection. This is a significant safety concern.
Diagnostic Approach
The shift-by-wire module is located with the shifter mechanism - on column-shift trucks, it's in the steering column area; on console-shift models, it's in the center console. Check module power and ground supplies. Verify CAN communication is reaching the module. Console spills or steering column damage can affect these electronic components.
Repair Requirements
The 2023 Sierra may have a manual override for Park release in emergency situations - consult the owner's manual. Module replacement requires GM diagnostic equipment for programming. The system must relearn shifter positions after service to ensure accurate gear selection.