U0103
NetworkModule Communicationhigh severityLost Communication with Gear Shift Control Module
What U0103 Means
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
Where to start: Check shift module power supply. Verify shifter mechanism is functional.
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