U0156high severityNetwork
Lost Communication with Electronic Shift Module
on 2013 Cadillac ATS 2.0L Turbo I4 · RWD
What this code 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
Repair notes
Check brake-shift interlock solenoid and fuses. Override button usually on shifter for emergency.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus