U0156
NetworkModule Communicationhigh severityLost Communication with Electronic Shift Module
What U0156 Means
Cannot communicate with the electronic range select or column/console shifter module.
Symptoms
- Cannot shift out of park
- Shift indicator incorrect
- Gear selection not recognized
- Transmission defaults to limp mode
Common Causes
- Shift module failure
- Wiring issue
- Module power loss
- Fuse blown
- Shifter mechanism jam
Diagnostic Steps
- Check shift module fuse
- Test power and ground
- Check wiring to shifter
- Test shift position sensor
- Check for mechanical shifter issues
Where to start: Check brake-shift interlock solenoid and fuses. Override button usually on shifter for emergency.
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