Lost Communication with Gear Shift Control Module
2003-2024 Chevrolet Express 4.3L V6
Description
Cannot communicate with the gear shift module that manages electronic shifter input.
Symptoms
- Shifter inoperative
- Transmission stuck in park
- Shift indicator not matching
- Cannot select gears
Common Causes
- Shift module power failure
- CAN bus wiring issue
- Shift module failure
- Shifter cable disconnected
- Fuse blown
Diagnostic Steps
- Check shift module fuse
- Test module power and ground
- Inspect CAN wiring
- Check shifter mechanism
- Test shift position switches
Repair Notes
Check shift module power supply. Verify shifter mechanism is functional.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0005High Speed CAN Communication Bus (+) High
U0103 on Other Vehicles
Chevrolet Avalanche
2002-2006 5.3L V8 Vortec
Chevrolet Avalanche
2002-2006 8.1L V8 Vortec
Chevrolet Avalanche
2007-2013 5.3L V8 Vortec
Chevrolet Avalanche
2007-2013 6.0L V8 Vortec
Chevrolet Aveo
2012-2018 1.6L I4
Chevrolet Beat
2018-2021 1.2L I4
Chevrolet Blazer
2019-2024 2.0L I4 Turbo
Chevrolet Blazer
2019-2024 2.5L I4
Common Questions
What does code U0103 mean on a 2003-2024 Chevrolet Express?
U0103 stands for "Lost Communication with Gear Shift Control Module". Cannot communicate with the gear shift module that manages electronic shifter input.
What are the symptoms of U0103 on a Chevrolet Express?
Common symptoms of U0103 include: Shifter inoperative, Transmission stuck in park, Shift indicator not matching, Cannot select gears.
What causes U0103 on a 2003-2024 Chevrolet Express?
Common causes of U0103 include: Shift module power failure, CAN bus wiring issue, Shift module failure, Shifter cable disconnected, Fuse blown.